A Car Is Traveling in a Straight Line Along The x

Multiple Choice

A car is traveling in a straight line along the $x$ axis. At time $t = 2.1 \mathrm {~s}$ , the position is $x = 3.9 \mathrm {~m}$ ; and at time $t = 5.6 \mathrm {~s}$ , the position is $x = 52.8 \mathrm {~m}$ . The average velocity of the car is

A) 11 m/s.
B) 14 m/s.
C) 18 m/s.
D) 22 m/s.