Who of the Following People Is Most Likely to Develop

Who of the following people is most likely to develop stress-related illness?

A) Susan,who lives alone but volunteers at the local skilled nursing home two times per month
B) John,who lives with two good friends from high school
C) Jaime,who lives with a quiet roommate,belongs to a big family,works for a growing company,and is described as a very "sociable" guy by all who know him
D) Dora,who lives alone,works from her home,and prefers to keep to herself