**A. ** B-cells
Which type of white blood cells is produced in the thymus and destroys the cell membranes of bacteria are B-cells. These b-cells are also known and called as B lymphocytes. Their function primarily is to create antibodies which combats antigens such as bacteria. They are also responsible for immune regulatory indications –cytokines. In contrast, T-cells are a type of white blood cells that combat any substance from the inside or within the body.
a ;
The type of white blood cell produced in the thymus that destroys the cell membranes of bacteria is T-cells. T-cells, specifically cytotoxic T-cells, are responsible for targeting and eliminating infected cells. Therefore, the correct option is B. T-cells.
;