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Correct Option is The scientists used a powerful flashlight to illuminate Venus and then tracked its reflection.

The correct choice for the answer is option (a): The scientists revealed that their go-to method was to light up Venus with a giant flashlight and further on observe the reflections that had swept over the surface of Earth.
The answer can be found at the end of the second paragraph where it says “We illuminated Venus with a giant flashlight, the radar at Goldstone, and observed the reflections as they swept over the surface of the Earth," said UCLA planetary astronomy professor Jean-Luc Margot, who led the study published in the journal Nature Astronomy.”
Hence, option (a) is the correct choice for the answer.

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