Final answer:
The drop test method involves dropping objects into a safety net to test its ability to absorb impact. The correct answer is dropping bricks from different heights.
Step-by-step explanation:
The drop test method used to test the ability of a safety net to absorb an impact involves dropping objects from a height and observing the results. In this case, options a, b, c, and d represent different objects being dropped into the net. The correct answer is option c, dropping bricks from different heights into the net.