What is causing the boat to move toward the shore?
 A
 The moving water applies a force on the boat, which results in the boat pushing
 back on the water, propelling the boat forward.
 B
 The moving wind applies a force on the boat, which results in the boat pushing
 back on the wind, propelling the boat forward.
 с
 The boy applies a force on the oars, which results in the water pushing back on
 the oars, propelling the boat forward.
 D
 The boy applies a force on the oars, which results in gravity pushing back on the
 oars, propelling the boat forward.