Parallel structure or parallelism is used when words are united by grammatical forms. The lack of a parallel structure can disrupt the rhythm of the sentence, where the sentence is grammatically unbalanced. The use of parallelism achives a good balance in sentence, alignment of related ideas, clarity and readability. By associating related ideas, the point of analysis is emphasized, the arguments are connected, easily visible and in this way the analysis is clear and easy to understand.
The answer is: B.
