In paragraph 14, you just need to look at the text and think about what the paragraph is mainly about, then you’ll have your answer
For one, it's best to remain honest even when no ones looking. Secondly, i'm sure the author of what ever it is would like to receive credit for the work they've done. It's just morally & ethically wrong to accept credit for something that's not original work.
No, it does not according to the study. the study states it is just a placebo effect (it works because you expect it to.)
The last one seems to be the best choice
