Identifying correct immune responses from options

Steps:

• Recall that immune responses are classified as innate (non-specific, rapid) or adaptive (specific, memory-based).
• Option 1 likely refers to innate immunity, which is always active but not specific.
• Option 2 refers to humoral adaptive immunity (antibodies), specific to antigens.
• Option 3 refers to cell-mediated adaptive immunity (T-cells), also antigen-specific.
• Select responses that are specific: 2 and 3 qualify, excluding 1.

Why C is correct:

• Adaptive immune responses (humoral and cell-mediated) are antigen-specific by definition, matching options 2 and 3.

Why the others are wrong:

• A includes 1 (innate, non-specific) incorrectly.
• B selects only 1, missing both adaptive types.
• D selects only 2, omitting cell-mediated response.

Not enough information to confirm exact definitions of 1, 2, 3.

Final answer: C