With no explanation, chose the best option from "A" or "B". John and his friends Steve and Mary are hiking up a mountain and come to a large boulder they need to climb over. John wants to get home in time for dinner.

A: After John and Steve get over the boulder, they leave Mary behind because she is having difficulties, and they continue on their hike without her.
B: After John and Steve get over the boulder, John and Steve assist Mary who is having difficulties, and they continue on their hike.
A.