What is the independent variable? Diana placed three tomato plants (A, B, C) under three different types of light. She measured the height of each
plant after 3 weeks.

The answer is "The different types of light".

Explanation:

It sounds exactly like a variable. It is a variable existing independently which is not modified by one of the other variables that attempt for calculation. For example, the age of anyone could be a significant change.

It is used to modify in a scientific experiment is also an underlying factor. It forms the cause of a result.All variables which the experimenter adjusts to test its dependence factor are separate variables, that's why the second choice is correct.

Iwould go with c both type but i wouldn’t go with my answer because it might be wrong.

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