A Diver Weighing 138 Pounds Has Just Dived Up and Out

A diver weighing 138 pounds has just dived up and out from the high board and is doing a back flip before starting to descend toward the water.How much force does the diver exert on Earth while doing the back flip?

A) much more than 138 pounds because Earth is so much more massive than the diver
B) zero
C) much less than 138 pounds (but more than zero) because the diver has so much less mass than Earth
D) 138 pounds