Select the most appropriate option to fill in the blank.

Overindulgence in anything may prove ________ to health.

injurious

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

The word injurious means harmful or damaging to health. In this case, the sentence is saying that overindulgence in anything may prove injurious to health. This means that overindulgence in anything can be harmful or damaging to one's health.

The other options are not correct.

• Spurious means false or counterfeit. It cannot be used in this sentence because it does not describe something that is harmful or damaging to health.
• Repetitive means done or said many times in the same way. It cannot be used in this sentence because it does not describe something that is harmful or damaging to health.
• Commercial means relating to or engaged in commerce. It cannot be used in this sentence because it does not describe something that is harmful or damaging to health.