Answer
(b) is true.
Work Step by Step
The tangential and normal components for both cars are given by
$$a_T=v'(t), \quad a_N=\kappa v(t)^2$$
Since they are moving on a circular track, then the curvature is constant. Now, when their speeds read 110 mph, then their acceleration have the same normal components. That is, (b) is true.
