Respuesta :
The following shows correct parallel structure is D. Maria makes extra money as a typist, as a waitress, and as a babysitter.
What are the parallel structure?
Parallel structure method the usage of the equal sample of phrases to expose that  or extra thoughts have the equal stage of importance. This can occur on the word, phrase, or clause stage. The normal manner to enroll in parallel systems is with using coordinating conjunctions such as "and" or "or."
Maria makes extra money as a typist, as a waitress, and as a babysitter it clearly defines the parallel structure.
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