Dressing appropriately for exercise includes
a.
wearing the same clothes for all exercises
b.
choosing dark colored clothing when exercising at night
c.
wearing sunscreen when exercising outside
d.
making sure you wear the best brand-name clothes

The right answer for this question is C. Wearing sunscreen when exercising outside is incredibly important, especially when intending to fit in a full work-out that will mean you're outside for a long time. The other answers refer to purely superficial details, which are not important when preparing for exercise.