The correct idioms are: X is likely to Y X is at a disadvantage X is unable to Y Only answer choice A give us all of these correct idioms. In answer choice A, likely is an adjective. Any form of the verb to be indicates a state of being. The subject, which is a noun, cannot be an adverb. The subject can be only an adjective or another noun. Mary is happy. (noun = adjective) Mary is an astronaut. (noun = noun) Not: Mary is quickly. (A noun cannot = adverb).
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