The force that enables the mass of the airplane to be pulled down to the ground is gravity. Thus, option A is correct.
A force is given as the strength or energy that attributes to the physical movement. The force can be applied externally to the object or can drive by the nature as well.
Earth has been comprising of the gravitational force that enables the motion of the objects towards the ground. Thus, the force experienced by the airplane driving it to the ground is gravity. Hence, option A is correct.
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