A particle moves along a circular streamline with velocity (6f(t)/s), where (f(t)) is increasing at (1.5f(t)/s). What is the magnitude of the particle's acceleration?
a) (6f(t)/s²)
b) (7.5f(t)/s²)
c) (9f(t)/s²)
d) (10.5f(t)/s²)