Read the following context and choose the best option to answer the question.
Context: We drove to the nearby Blue Ridge Parkway where we found a trail that wrapped around a lake . As we walked , we debated man 's capacity to change himself . Later , the girls watched movies , and the guys continued the ping pong wars while watching football .
Question: What was the topic of conversation on the walk ?
Options: 
A. How wars are fought .
B. How ping pong is played .
C. How girls treat each other .
D. How men tend to evolve .


D