Sentence 4 about year round schooling helps students learn and retain more seems not to be backed up with the evidence and that it may just be a supposition as a better approach might be to coampare the pros and cons of each and at least include the importance of students having a break to rest their brains as constant schooling could become oppressive.
Answer: Oc is the answer.
Explanation: I took the test.
The correct answer would be : B) An important part of my life has been the people who stood by me.
I hope that this helps you !