The structure as…as is used to compare things that are of similar proportion.
In this case the first as acts as an adverb modifying the adjective or adverb that goes after it. The second as can act as a preposition or conjunction.If it is used as a conjunction, it will be followed by a clause. Like, in this case, the first as modifies the adjective "talented", the second as acts like a conjunction, and is followed by a second clause "she is". Therefore the sentence is grammatically correct. Hence, Option A is appropriate. The rest of the options do not adhere to this rule, hence incorrect.