Which of the following is an effective topic sentence for a cause-and-effect essay?
a) According to Lexi Nielson, a physical therapist, it is very important to do your exercises at home.
b) According to WebMD, physical therapy "is care that aims to ease pain and help you function, move, and live better."
c) Did you know that many people need to go to physical therapy every year as they heal from injuries?
d) Following the advice of a physical therapist is an important part of healing from an injury.