Answer:
B.
The topic sentence outlines (obviously) the topic of an essay or other written work. This usually contains the main idea (think about an introductory paragraph. A topic sentence is this, but condensed into a sentence.)
They are thankful for the gifts but they don't know what to do with them because the gifts are either invisible or there are no gifts at all.
B would be the correct answer.
I would want to believe that A C and D where the right answers