Answer :
Activated B cells produce a. plasma cells and d. memory B cells during clonal expansion.
When a B cell is activated, it undergoes clonal expansion and produces two main types of cells: plasma cells and memory B cells.
Plasma cells are responsible for producing and secreting antibodies that target specific antigens, while memory B cells persist long-term in the body to provide a quicker response if the same antigen is encountered again. This process ensures that the immune system can effectively respond to and remember the specific pathogens it has encountered.
Thus, options a and d are correct.
