Answer:
D. Rainbows are optical illusions caused by water droplets reflecting
light.
Step-by-step explanation:
In order to support such argument, it's necesary to collect relevant data that can properly lead facts about something into a consistent conclusion. This is known as deductive reasoning. In the case of rainbows, since it's a fact that they're optical illusions, it's possible to draw the conclusion that these are not objects.