Which sentence has proper parallel structure?
a. the proposal affects three groups: students, parents, and teachers.
b. we posted the notice whereever people meet, on the internet, and in the office.
c. we know who supports us, our opponents, and who has not yet decided.

The correct answer is A. The proposal affects three groups: students, parents, and teachers.

Explanation:

Parallel structure or parallelism occurs when in a sentence different ideas or items follow the same grammatical structure or pattern. This implies the way ideas or items related to other words in the sentence is the same or parallel. Additionally, parallelism makes texts easier to understand as it group words and relate to only one grammatical structure at once. In the case of "The proposal affects three groups: students, parents, and teachers", the first grammatical structure "The proposal affects three groups" is applied to different items "students, parents and teacher" due to this, this sentences follow a proper parallel structure considering the items in the list are related to the same structure and items are put together to express a concise idea.

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and also the mystery girl it might be someone that she might know in her school