Hey there!
The most common belief for why he did this was to promote originality. Most poets in that time used rhyming meters, and they still do today. In fact, you were probably taught rhyming meters in school - they follow rhythm and pattern that isn't subject to change.
Robert Frost wanted to break the rules. Considering the nonexistent popularity of the style he intended to use, he created an entire new type of poetry and writing by breaking the rules themselves. There was no rhyme, but there certainly was reason.
Hope this helps!
Answer: You won't learn a lesson if you don't study regularly.
Explanation: *shrugs*
The correct answer is D. This sentence is a perfect example of parallel structure because either after and before AND it in both cases uses simple past tense verbs which are LEARNED AND TRAVELED. The other sentences never show parallelism due to their units are never the same. For example, in letter A , it uses a verb in simple present WALKS AND a progressive tense verb which is TAKING. So, to sum up, for a sentence to be considered parallel, it must be coherent in its structure and internal words. They need to have harmony and unity in tenses as well.