A thesis with a general topic (your answer is a) because then you break down your essay into more detail, using the topic sentence you created to describe what you would be talking about in your essay. Hope this helps.
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.
I think the answer is Im worried because I havent heard from you in a while. Hope this helps!
