Of int, char, float, and bool, which is smallest?

Question

The following is from a \"fill-in at home\" programming test that is part of the application process for an MSc in game development at a UK university:

C+

Answer 1

The typical size of a bool is one byte. does not means it always is one byte. The question either refers to a realization that have not one-byte-sized bool or implies that only one variable has a smallest size.