B. regular exercise
Note that the question says "does NOT contribute to POOR food choices".
A) contributes to poor food choices, because food that generally can be made in a couple of minutes are rarely healthy.
C) contributes to poor food choices, because when people are under stress, they tend to stress eat, and eat whatever is in reach.
D) contributes to poor food choices, because many times if you don't find time to have a consistent meal time, like A, you will opt for unhealthier but faster food.
hope this helps