A couple delivered a full-term baby girl 3 years ago. They have been attempting pregnancy for the past 2 years without success. When taking a history from the couple, which of the following may lead to abnormal sperm number and function in the male?
a. His job requires him to walk most of the day with few rest periods.
b. He was infected with mumps 3 years ago before the birth of his girl.
c. He was diagnosed with hypertension 2 years ago and is under medical treatment.
d. His job requires him to be outside about 7 hours out of the 8 hours at work.