Immune cells in body fluids and tissues

Steps:

• Identify the locations as likely blood, interstitial fluid, and lymph based on immunology context.
• Recall that phagocytes (e.g., neutrophils, macrophages) circulate in blood, migrate to tissues via interstitial fluid, and enter lymph.
• Check each option's presence pattern against biological distribution.
• Select the option where the pattern matches all locations (✓ ✓ ✓).

Why D is correct:

• Phagocytes are mobile immune cells present in blood, interstitial fluid, and lymph to engulf pathogens, per innate immunity definition.

Why the others are wrong:

• A: Antibodies are absent in initial blood plasma formation but present in interstitial fluid and lymph; "proteins" pattern mismatches.
• B: Large plasma proteins remain in blood but do not freely enter interstitial fluid or lymph due to capillary permeability limits.
• C: Lymphocytes are primarily in blood and lymph but less common in interstitial fluid without inflammation.

Not enough information on exact locations to confirm beyond standard assumptions.

Final answer: D