**Core Concept**
Humoral immunity is a type of immune response that involves the activation of B cells, which differentiate into plasma cells that produce antibodies. This type of immunity is crucial for neutralizing pathogens, such as viruses and bacteria, and is mediated by secreted antibodies.

**Why the Correct Answer is Right**
The correct answer is related to the B cell-antibody pathway. When B cells encounter antigens, they undergo clonal expansion, and some differentiate into plasma cells that produce large amounts of antibodies. These antibodies can bind to specific epitopes on pathogens, marking them for destruction by other immune cells or neutralizing their ability to infect cells. The key enzymes involved in this process include Bruton's tyrosine kinase (BTK), which is essential for B cell receptor signaling, and activation-induced cytidine deaminase (AID), which is involved in antibody class switching.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the mechanism of humoral immunity. While T cells play a crucial role in cell-mediated immunity, they are not primarily responsible for producing antibodies.
**Option B:** This option is incorrect because it mischaracterizes the role of neutrophils in the immune response. Neutrophils are primarily involved in phagocytosis and are not responsible for producing antibodies.
**Option C:** This option is incorrect because it refers to a type of cell-mediated immunity, not humoral immunity. Cytotoxic T cells are a type of T cell that recognizes and kills infected cells or tumor cells.

**Clinical Pearl / High-Yield Fact**
One key point to remember is that humoral immunity is crucial for protecting against pathogens that cause diseases such as measles, mumps, and rubella. Vaccines that induce humoral immunity by stimulating the production of specific antibodies are often effective in preventing these diseases.

**Correct Answer:** B. B cells produce antibodies that are responsible for humoral immunity.