Improve the highlighted part of the sentence. Choose 'No improvement' as an answer if the sentence is grammatically correct.
If you don't water your houseplants, they will dies.

Correct option is A

The correct substitution is (a) will die.
Explanation: The phrase "will dies" is grammatically incorrect because "will" is a modal verb, and modal verbs are always followed by the base form of the verb (without any inflection). The correct form is "will die" (base form of "die"), which is the simple future tense. The future tense is used to express actions that are expected to happen in the future.
Corrected sentence: If you don't water your houseplants, they will die.
Grammatical rule used: When using modal verbs (like "will," "can," "may"), the main verb should be in its base form. For example: He will go to the market (not "He will goes").