The velocity, v(t), of a particle, in inches per second, at time t seconds is v(t) = 4t³ + 3t² + 2t + 1. What distance does the particle travel over the interval 0 ≤ t ≤ 1?
a. 3 in.
b. 4 in.
c. 9 in.
d. 18 in.