Correct option is A
Option (a) "you will water" contains an error.
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Explanation: The phrase "unless you will water" is incorrect because the word "unless" is a subordinating conjunction used to introduce a condition, and the verb in the conditional clause should be in the simple present tense, not the future tense. The correct phrase should be "unless you water."
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Grammatical rule used: In conditional sentences, when "unless" is used, the verb following it should be in the simple present tense to express a condition that must be fulfilled for the main clause to happen.
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Example:
· Incorrect: The plant will die unless you will water it every day.
· Correct: The plant will die unless you water it every day.