The correct answer is B. I'd really like to get to know you better.
Explanation:
In communication, the message is the main idea or piece of information you want to send to the receiver, due to this, your message should be adjusted depending on both the receiver and your purpose. This means in the case of sending a note to someone you have admired for a long time the best statement to use is "I'd really like to get to know you better" because through this statement the receiver will understand the interest you have for him/her, also this statement is more appropriate because others such as "I stuck up for you in a conversation the other day" or "I've seen you across the room a lot during the past year" might send the wrong message or confuse the receiver about your purpose.
