Which phrase best defines rocks? A. objects made of crystals, minerals, water, and air B. objects made of crystals and water C. objects made of one or more minerals D. objects made of minerals and organic matter

A. objects made of crystals minerals water and air

Process of elimination-

there isn’t organic matter in rocks so D is out

they are made of minerals so B is out

some types of rock (pumice) have air bubbles in them so A is more likely than C