Which sentence has the correct parallel structure? paul was not only my best friend and also my brother. paul was not only my best friend but also my brother. paul was not only my best friend and my brother. paul was not only by best friend while also he was my brother.

The answer is B Paul was not only my best friend but also my brother.

And this is why...

Parallel structure, is the repetition of a chosen grammatical form within a sentence. By making each compared item or idea in your sentence follow the same grammatical pattern

You could also just read them out loud and which ever one sounds right is usually the right one, if you are native to English.

I hope this helps.

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