Answer:
B.Air exerts forces on falling object near earth's surface.
Step-by-step explanation:
Free fall: When no external force like air resistance act on the body only gravity force act on the body then we say the body falling freely.
Gravity force :It is that force which act on the center of the body and and body fall towards earth.
Force due to gravity is given by
F=mg
Where
m=Mass of the body
g=Acceleration due to gravity
But when the object that fall near earth's surface then molecules of air exert force on the object .Therefor, air resistance force act on the body near earth's surface.
When the air resistance act on the body then the object that fall near earth's surface is not free fall because both force act on the body force due to gravity and air resistance.
Air resistance force act on the object in opposite to direction of gravity.
B.Air exerts forces on falling object near earth's surface.