Your employer is providing you with very limited choices. Your options include only 1 index fund, 1 bond fund (PIMCO), 2 international funds, and the rest are all actively managed domestic equity.
Start by identifying what the expense ratio is for each fund. The expense ratio lowers your returns by that amount each year in order to pay the asset manager. You will find that the lowest expense ratio among these selections is found with the Vanguard Institutional Index Fund at about 0.05%. Tough to beat that.
If you see any funds charging 12b-1 fees, avoid those at all costs. In fact, many employers hire an outside advisor to help with the selection and management of their retirement accounts. What they often do not realize is that the more unscrupulous advisors will provide a selection of funds with 12b-1 fees that essentially generate an extra sales commission or kickback on each dollar invested. These fees are in addition to the annual advising fee that the employer pays to the advisor. Often company management is unaware of this relationship.
As far as your selection among these funds, focus on asset allocation at the lowest cost. Research has shown that 90-95% of a portfolios long-term performance is based on asset allocation as opposed to security picking. So in addition to knowing the expense ratio of each fund, understand where each fund falls within a standard "style box". This is a 3x3 matrix of size (large, mid, small) and style (value, blend, growth). If your selected funds overlap too much, you will not end up with the diversification initially thought.
If you are young, you can invest mostly in equities. I would suggest something like 80% domestic and 20% international or maybe even 70-30 if you wanted to get more aggressive. I'm personally a little more cautious on international right now. Several years with a falling dollar and strong emerging markets returns have caused me to believe that things may swing back the other way.
If you would like some fixed income exposure, then you have no choice but to go with the PIMCO fund, but I think its 0.43% expense ratio is still high for a bond fund, especially when long-bonds are only yielding 4.5% in the market. At the same time, this is a lower expense ratio compared to most actively managed bond funds.
The Vanguard Institutional Index fund is the only domestic equity fund that I would invest in among your available options. As far as the two international options, I would probably lean toward the Fidelity Diversified International Equity Fund. However, be aware of which countries an international fund invests in. Some "global" funds also invest in the US market, so you can end up with less international exposure than it appears on the surface.
Finally, if you really want to grow the retirement account, take full advantage of your employer's matching of your retirement accounts. Think of this as free money and a 100% automatic return on every dollar you invest. Contribute as much as you can at least up to the point where the matching cut-off lies. It is better to be a little poor during those early yers.
Best of luck.