He can't afford to live his lifestyle anymore
The best way to combine these sentence into one correctly complete one is to use semicolon. In general, semicolon is used in order to combine two sentences that share similar idea into one. It is needed to avoid repetition and redundancy. So the correct sentence looks like this: These trains were not toys; they were detailed models built to try out ideas for real trains.
My first choice would be A. When you read the excerpt, how does it make you feel? That's your first clue to the answer. If they want something book specific, I would choose C.
The correct answer is Harriet Tubman
