You Spin Your Little Brother on a "Helicopter" Ride, Which

You spin your little brother on a "helicopter" ride, which means you hold hands and spin around a vertical axis, usually resulting in the little brother's feet lifting off the ground. During the "ride", the acceleration of your brother is

A) inward toward you, and you must pull him inward.
B) inward toward you, but you push him outward.
C) tangential to the circular path, and that is why it takes two hands to give helicopter rides.
D) outward from you, but he pushes you inward.
E) outward from you because circular paths always have centrifugal acceleration.