There are more than 200 different cold viruses. You can build up protection against a cold virus that you have already had. How ever, this 'immunity' can not help a person fight off a different cold virus.

Immunity means:
A. the spread of a disease
B. the body's ability to fight of disease
C. a way to keep sick people away
D. an anti cold medicine

I think it's B

Right.

You are correct, the answer is B. Immunity refers to the body's ability to fight off disease. In the context of the question, immunity is the protection that a person develops against a specific cold virus after being infected with it. When a person is exposed to a specific cold virus and becomes sick, their immune system responds by producing antibodies that help fight off the infection. These antibodies remain in the body even after the person recovers, allowing them to react more quickly and effectively if they encounter the same virus again in the future. This is why people generally don't get sick from the same cold virus multiple times. However, it is important to note that immunity to one cold virus does not provide protection against other cold viruses, as each virus has unique characteristics and requires a specific immune response.