Jeffe is explaining dimensional analysis to a friend. He says that dimensional analysis can be used to convert between units. What is needed for this conversion?

Dimensional analysis converts a measurement by multiplying by a conversion factor: an equality stating how much of one unit equals another. For example, 1 meter = 100 centimeters lets you convert between meters and centimeters. Therefore, the needed item is an equality between units, choice C.

AI-written and checked against the verified answer.