Assertion: The two bodies of masses M and m (M > m) are allowed to fall from the same height if the air resistance for each be the same then both the bodies will reach the earth simultaneously. Reason : For same air resistance, acceleration of both the bodies will be same What is answer ?

Hello
Answer - Both assertion and reason are false.
Two forces acting on the body of mass M are weight (Mg, where g = acceleration due to gravity) that can be seen acting vertically downwards and second one is the air resistance acting vertically upward.

Acceleration of the body
a = (Mg - F)/M
a = g - F/M

Since, M > m (Given) therefore, the body with larger mass will be accelerated more and hence it will reach the ground first.