Which statement is the best definition of matter? 

A)  Matter has the capacity to change in form. 
B)  Matter has the ability to produce change. 
C)  Matter has mass and occupies space. 
D)  Matter has the capacity to do work.

Matter is defined as anything that has mass and takes up space. Option C states this definition accurately. Option A refers to the ability of matter to change in form, but this is a property of matter rather than a definition. Option B refers to the effects of matter rather than what matter itself is. Option D refers to energy, which is related to matter but not a definition of it.