[单选题]
A wheel starts from rest and reaches an 67ge nlg4bo -oangular speed of 6.0 rad/s while h q7.by xxco4s4bf:x /turning through 2.0 revolutioh .osyb:bcxxq x47f/ 4ns. What is the average angular acceleration of the wheel?
A. $0.24 \; rad/s^2$
B. $1.4 \; rad/s^2$
C. $3.0 \; rad/s^2$
D. $9.0 \; rad/s^2$
