Immunity from Injections vs. Vaccines

Steps:

• Antibodies injection delivers pre-formed antibodies, causing immediate high concentration that declines quickly (passive immunity).
• Vaccine triggers immune response, leading to gradual antibody increase as body produces its own (active immunity).
• Both are artificial due to human intervention via injection, not natural exposure.
• Graph distinguishes: G shows rapid peak and drop (antibodies, passive); H shows rising levels (vaccine, active).

Why B is correct:

• Matches definitions: artificial passive uses external antibodies for short-term protection; artificial active stimulates endogenous production for longer immunity.

Why the others are wrong:

• A: Reverses G and H assignments, mismatching graph trends.
• C: Claims natural immunity, but injections are artificial, not from infection or maternal transfer.
• D: Also claims natural, ignoring artificial nature of injections.

Final answer: B