C I think cause in the book it say revenge but guilt kinda has almost the same
Answer: Other scientists did not take rockets seriously.
Explanation:
Demonstrating bravery huh? It doesn't seem too hard to explain. Say, for example your talking about a fictional story, right? Depending on what that said character does, depends on his/her bravery for he/she did. If you can implement something similar to that in whatever it was you had in mind, it might help.
I really hope this helps.
Remind, or to let someone know a certain thing.
<span>"There is no greater guide to our success than the lesson taught by our own mistake"</span>