The predominant antibody of a typical primary immune response is IgM. Thus, option (b) is correct.
What is an antibody?
The protein the immune system of the body makes when it recognizes dangerous chemicals, known as antigens, is referred to as an antibody. These undesirable chemicals are removed from the human body by antibodies that bind to them.
The immune response is first challenged and for some non-peptide antigens, the term IgM is the predominant antibody. On successive interactions with the antigen, IgM may be the only isotype of antibody released.
As a result, the predominant antibody was the response of IgM.
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Your question is incomplete, but most probably the full question was.
