Assertion: A particle is moving on a horizontal surface its path will be straight line if initial velocity and acceleration are along same horizontal surface.
Reason: An between `vec u` and `vec a` determine particle therefore. It may be accelerated or retarded curvilinear.
A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If assersion is false but reason is true.