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.