In One Study on the Effects of Stress, Dental Students

In one study on the effects of stress, dental students received one small puncture wound on the roof of their mouth during their summer vacation and a second wound three days before their first major exam during the fall term. The researchers found that:

A) on the average, wounds inflicted during summer vacation took three days longer to heal than wounds inflicted just before the major exam.
B) telomeres increased in length and telomerase activity decreased.
C) on the average, wounds inflicted just before the major exam took three days longer to heal than the wounds inflicted during summer vacation.
D) telomeres decreased in length and telomerase activity increased.