Lois Is a 65-Year-Old Woman Who Participates in an Exercise

Lois is a 65-year-old woman who participates in an exercise class three times a week. In addition, she drinks six glasses of water each day and regularly consumes fresh fruits and vegetables as well as whole-grain breads and cereals. Lois has high blood pressure, takes medication for her hypertension, and experiences constipation frequently. What is the most likely cause of her constipation?

A) High fiber intake
B) Insufficient exercise
C) Medication
D) High fluid intake
E) High-fat diet