[单选题]
A 1.53-kg mass hangs on a 0c2kq(ppmfj/r,gyhc+k7l3n y ope wrapped around a frictionless disk pulley of mass 7.07 kg and radius 66.0 cm. What is the angular acceleration c73yglk +,nhy of the pulley?
A. $4.49 \; rad/s^2$
B. $7.98 \; rad/s^2$
C. $9.87 \; rad/s^2$
D. zero
