Company 401k Roth Ira options... many to choose yet unsure of what to pick

With a 4% match I plan on putting 15% of checks into this account. Yet there are so many options, with my small understanding I chose VIIIX, but wondering if I should diversify or not.

Any advice/guidance is appreciated.

Thank you

With a 4% match I plan on putting 15% of checks into this account. Yet there are so many options, with my small understanding I chose VIIIX, but wondering if I should diversify or not.

Any advice/guidance is appreciated.

Thank you