Which sentence is a simple sentence?

ATed and Kellie celebrated their wedding outside in the Florida heat surrounded by friends and family.

BWhile Mary sat at home worrying, Bill was out on the town having a wild time with his closest friends.

CGamston looked everywhere inside the house for his lost keys, and his sister searched everywhere outside in the yard.

DWhen Alice stepped through the looking glass, she felt a queasy sort of dizziness, but she managed to forget her unease in all her excitement.