i think the answer you are looking for is answer A.
Answer:
Depending on how you act or interact with people can have a major impact on how others see you and can even change the way you see yourself such as if you were to be hostile when interacting with others you would be defined as a hostile person or if you where kind then you would be defined as kind and outgoing.
Explanation:
Hope you found this helpful :D
(Note: In my opinion I believe nothing defines who you are. You are who you choose to be and you should just be you.)
Answer:
Emerson was an American poet and philosopher that talked about individualism and that people should not accept help from anyone else and on this, one of his beliefs was that you should not focus on learning what you can find on books that is knowledge from the past and instead of that, look for the thruth in your heart.
According to that, the answer is that the drawback of relying too much on books according to Emerson is that they make you focus on the knowledge from the past instead of looking for the thruth in your heart.
Not many people are going to be willing to read a book for your question