Which of the following is associated with the thymus?
a. b cells
b. t cell maturation
c. natural killer cells
d. complement

Option B. "T Cell maturation"

Explanation:

T-cell, also known as T lymphocyte, are primary type of leukocyte or white blood cell important part of the immune system.

Bone marrow is the origin of T-cells and then get mature in the thymus. In thymus, T- cells differentiate or multiply into regulatory, or cytotoxic T-cells helper, or act as memory T-cells.

T-cells then  move in lymphatic system, once get stimulated by appropriate antigen, helper T-cells secrete cytokines that stimulate antibody-producing cells called B cells. Regulatory T-cells control immune reactions while Cytotoxic T-cells kill infected cells or cancer cells.

Hence, the correct answer is Option B.

none

explanation:

you did not provide anything to go off of.