try standing up, and turn 90* and see how many times it takes to make a full turn, the equation would be 360* in a full turn divided by 90* a _______ turn, 90* go"s in to 360* 4 times so _______ is one-quarter turn or C.
Your answer is C because quart means 4 and if you have rotated a 90* turn that means you have rotated One quarter and the only answer that matches that is C