Janice, Who Is 55 Years Old, Needs to Get Three

Multiple Choice

Janice, who is 55 years old, needs to get three projects done by the end of the week at work. When she was younger, she would have worked on all three projects more or less at the same time. Now that she is older, however, Janice needs to work on one project at a time. Janice's current inability to multitask is due to changes in her _____.

A) vision
B) flexibility
C) brain
D) expertise