For this question, we need to know the definition of an aneroid barometer in DS's textbook. It is, "Aneroid Barometer: Aneroid means without liquid. An instrument used to measure atmospheric pressure; based on the movement of the lid of a metal box."

Q. An aneroid barometer is an instrument used to measure ___?

a. Atmospheric pressure
b. Liquid Pressure
c. (Something else.)

The correct answer was b.