Answer:
Option (a).
Step-by-step explanation:
Lymphoma can be defined as a cancer of lymphocytes, a type of immune cells. These cells are present in lymph nodes, lymphoma causes swelling of lymph nodes prevents their proper functioning.
As lymphocytes play important role in immune reactions, there would be no enough normal lymphocytes (T cells and B cells) to fight various bacterial and viral infections and affected people would be more likely to be infected by pathogens, such as bacteria and viruses.
Thus, the correct answer is option (a).