What function is most directly lost when t-cells die?
a) ability to activate b lymphocytes
b) ability to attack virus-infected cells
c) ability to create an inflammatory response
d) ability to present antigens
e) ability to release histamine
f) ability to secrete antibodies

Option A

Explanation:

The T-cells and B-cells of the immune system are the part of specific immune response.

If the number of T-cells dies then the ability to activate B lymphocytes will also be lost as they help B-cells to secrete antibodies and macrophages to destroy the antigens.

T cells also helps in the activation of cytotoxic T-cells to kill the targeted cell which is affected by antigens.

hence, the correct answer is option A