[单选题]
A wheel starts from res .)jq.wm 4rqsut and reaches an anguljx,uosir+u pa (6y h9hb+;*di ar speed of 6.0 rad/s while turning through 2.0 revolutions. What is the average angular acceleration o+ajh9i(6i* bpr y shox;, +uudf the wheel?
A. $0.24 \; rad/s^2$
B. $1.4 \; rad/s^2$
C. $3.0 \; rad/s^2$
D. $9.0 \; rad/s^2$
