A self propelled car (point mass) runs on a track with constant speed V It passes through three positions A,B, and C on the circular part of track. Suppose $N_A\;N_B$ and $N_C$ are normal force exerted by the track on the car. When passing through A,B, and C respectively then

Question

$$(a)\;N_A=N_B=N_C\quad (b)\;N_B > N_A > N_C \quad (c)\;N_C >N_A>N_B \quad (d)\;N_B>N_C > N_A$$