[单选题]
A wheel starts from rest and reaches an anaak+y rx+zj r)90 y)zagular speed of 6.0 t9qa;,izjf w2 rad/s while turning through 2.0 revolutions. What is the average atw iqz92;f,j angular acceleration of the wheel?
A. $0.24 \; rad/s^2$
B. $1.4 \; rad/s^2$
C. $3.0 \; rad/s^2$
D. $9.0 \; rad/s^2$
