The sentence "Mari's paintings revealed her talent and demonstrated her patience" contains correct parallel structure. (option A)
Parallelism or parallel structure consists of the repetition of a certain grammatical structure inside a sentence. The purpose of such repetition is to avoid confusion, making the speech clear, interesting, and easy to understand.
The option that contains correct parallel structure among the ones provided is letter A. We have two structures referring to Mari's paintings:
Both structures are the same. They contain a verb in the past, a possessive adjective, and a noun. That means we have parallel structures. Since that does not happen in the other options, letter A is the correct answer.
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