This is a test of commonsense with single/multi-choices. Complete the next sentence:

Two men push a small private helicopter out of its shed. They land on a beach, then fly it over the clear ocean water. they

Available options: (i) walk, underwater, along a grassy beach.. (ii) skydive, opening their parachutes as they get closer to the water.. (iii) tune up the helicopter to maintain speed, then lift off.. (iv) sail a boat back and forth over the calm waters of the ocean..
The answer is:
(ii)