I believe A would be the best answer. In the question, it states that Shawn has trouble understanding the ideas. So, rephrasing the ideas in his own words would help.
I hope this helped u!
Both are correct. Example sentences below.
In three hours, we will arrive at our house.
In three more hours, we will arrive at our house.
When using "more", it implies that there was time that was previously passed.
the anaswer is "c" i just took the test
