As the sky diver falls to earth, she experiences positive acceleration due to

The gravitional pull of the Earth

Explanation:

Anything that has mass also has gravity. Objects with more mass have more gravity. Gravity also gets weaker with distance. So, the closer objects are to each other, the stronger their gravitational pull is. Since the earth has more it will cuase you to be, almost attracted by it.

Also, Gravity is inversely proportional to the square of the distance that separates the two bodies. Hence gravity will decrease as one will go higher in altitude, and hence away from the center of mass.

But since your falling from a plane, or some other type of aircraft, your moving closer to the center of mass, hence your gravitational pull get stronger as you falling closer-and-closer to the ground.

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