Fill in the blank with the most appropriate word.
Either your brakes or your eyesight __________ at fault.
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A verb is used to express an occurrence, action, or state. It is the grammatical center of the predicate in a sentence.
An auxiliary verb is a verb which gives is used in the formation of tenses, moods, tones, etc.
Option A is correct as at fault indicates the use of simple present tense.
The other options are wrong as no other tense can be used here.
The correct answer is A)is