What is mainly discussed in the passage?

Câu hỏi: Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 35 to 42.
A signature usually contains either a first name and a surname, or initials and a surname, or, less frequently a first name and initials. Your first name represents your private or family self, and your surname represents your public self, how you are socially and at work.
If your first name is more prominent in your signature, this implies that you have positive feelings about your childhood and that your "private" self is more important to you than your "public" self. If your surname is more prominent, this means that your "public" self is more important to you. The more space between your name and surname, the more you wish to keep your public and private self separate. If you only use initials either for your first name or your surname in your signature, this means that you are more secretive about this part of your personality (your private or public persona).
A legible signature implies that you are a person with clear ideas and objectives. The more illegible your signature is, the less assertive you are as a person, and the more you tend to avoid conflict.
Most signatures are horizontal, rising or descending. A rising signature means that you are the kind of person who, when faced with problems, will work to overcome them. Usually optimistic, you are in control and ambitious. A descending signature means that you have a tendency to get depressed and give up when faced with problems, and lack self-confidence. Some people's signatures go through a temporary phase where they go down, which shows that they are going through a hard time or an illness. A horizontal signature suggests an emotionally stable person who is well-balanced and generally satisfied with the way their life is going. If your signature is bigger than the rest of the letter or document you have written, that means that you are self-confident and have quite a high opinion of yourself. Some people actually sign in capital letters, which suggests they are arrogant rather than self-confident. People whose signature is smaller than the rest of the text may be insecure and have low self-esteem.
What is mainly discussed in the passage?
A. Instructions of writing your signature
B. Changing your signatureas being inadvisable
C. What your signature says about you
D. Scientific facts behind signature