Your kidneys have to most direct effect on your circulatory system. Your heart pumps the blood into your kidneys and your kidneys keep your blood clean. without your kidneys, your blood would contain too much waste and water. without your heart, your kidneys wouldn't have the oxygen filled blood needed to do its job.
Going of by the number of angles (aka the blue dots) I‘m 99% sure the answer would be B. We start off with four angles and it decreases by one with each figure. We have 4,3,2... which leads me to believe that B, with 1 dot, would be the correct answer.
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The correct answer is c i believe