Why Are Leukocytes So Central to Second- Line Molecular Defenses

Why are leukocytes so central to second- line molecular defenses?

A) Leukocytes trigger other cells of the immune system to produce second- line molecular defenses.
B) Leukocytes have nothing to do with second- line molecular defenses.
C) Leukocytes respond to the production of second- line molecular defenses.
D) Leukocytes remove second- line molecular defenses to inhibit damage to healthy tissues in the surrounding area.
E) Leukocytes produce second- line molecular defenses.