The Clearance Volume of a Compressor Cylinder Is the ____

The clearance volume of a compressor cylinder is the ____.

A) amount of refrigerant vapor the compressor cylinder will hold during each stroke
B) volume by which the compressor is rated
C) volume of the space between the bottom of the valve plate and the top of the piston at the top of the stroke
D) total volume of the cylinder when the piston is at the bottom dead-center