Sentence 4
The topic sentence should set up what the paragraph is going to be about. This paragraph is about both heroes of the 1940s and heroes of the present, and sentence four is the only sentence that includes both. It also provides an indication that the paragraph is going to be comparing both types of heroes to each other.
D. A copy of your high school diploma
I therefore conclude that Learning from our mistakes and always conducting a positive attitude is the key to success. Having the confidence and optimistic attitude towards situations gradually helps you reach your goals.
Chronological order is a sequence of events, while compare and contrast puts two topics together and shows the differences and similarities.