Which of the following elderly adults is most likely to maintain healthy brain functioning? Question 1 options: 1) Fred watches television most of the day. 2) Martin’s wife passed away ten years ago. Martin has a son, and his son calls him once per week. Martin has a few acquaintances, but he has not developed close friendships. 3) Nathan tends to be isolated. His family lives far away from him, and often times, he will go an entire day without speaking to anyone. 4) Michael frequently reads and enjoys doing crossword puzzles. Michael also plays guitar with a band, and he enjoys taking his grandchildren to a nearby park.