Calculate the maximum acceleration of a moving car so that a body lying on the floor of the car remains stationary. The coefficient of static friction between the body and the floor is $0.15$ ($g=10{\text{m s}}^{-2}$):

1. A
   $1.2{\text{m s}}^{-2}$
2. B
   $150{\text{m s}}^{-2}$
3. C
   $1.5{\text{m s}}^{-2}$
4. D
   $50{\text{m s}}^{-2}$