Identify the sentence that incorporates parallel structure.
A) My week at camp included rock-climbing, mountain biking and sleep.
B) During my week at camp, I swam, hiked, biked and skiing on the lake.
C) My week at camp consisted of playing soccer, riding mountain bikes and crafts.
D) During my week at camp, I scaled the climbing wall, built a fort, and jumped on the trampoline.
Elim