Select the most appropriate option to fill in the blank and make a grammatically correct sentence.

Planets do not have light ______ their own.

of

The most appropriate option to fill in the blank is of.

The sentence is saying that planets do not produce their own light. The word "of" is used to indicate possession or origin. In this context, it makes sense to say that planets do not have light of their own, as they do not produce their own light.

The other options are not as appropriate. The word "on" indicates location. This does not make sense in the context of the sentence, as planets do not have light on them. The word "by" indicates means or agency. This does not make sense in the context of the sentence, as planets do not produce light by any means or agency. The word "for" indicates purpose or destination. This does not make sense in the context of the sentence, as planets do not have light for any purpose or destination.