Fact 1: Atape measure is used to measure length. Fact 2: Length is how long something is. Given the two facts above, what is a tape measure used for?

Choices:
A). in the frog family.
B). how long something is.
C). Males and females.
D). how dense something is.
E). the texture of something.
F). how much liquid there is.
G). objects that have mass.
H). lowered energy cost.
Answer:
B).