Which shaded region? are you talking about the region between the circle and square?
BBBBBBBB BBBBBBBBBBBBBBBB,CCCCCCCCC CCCCCCCCC CCCCCCCCC its B and C
C. 55 gallons because the formula for cylinder volume is V=pi•radius^2•height. So plug in the given values like in the pic below and then divide that by 231 to find the gallons
D . 3(5+7) that is the expression which is equivalent