Which revision best corrects the errors in given sentence?

The youngest campers ages 5
3-5 will listen to a story between lunchtime and naptime.

A. The youngest campers (ages 3-5) will listen to a story between lunchtime and naptime.

B. The youngest campers ages 3-5 will listen to a story between lunchtime (and naptime.)

C. The youngest campers ages 3-5 will listen to a story between lunchtime (and naptime)

I think A.