Final answer:
Diffuse large B-cell lymphoma (DLBCL) is the most common type of non-Hodgkin lymphoma (NHL), affecting B cells. B-ALL is the most common type of ALL.
Step-by-step explanation:
Diffuse large B-cell lymphoma (DLBCL) is the most common type of non-Hodgkin lymphoma (NHL), affecting B cells. DLBCL accounts for a significant percentage of all NHL cases, with approximately 20-30% of NHL cases being DLBCL. In comparison, T-cell acute lymphoblastic leukemia (T-ALL) is a less common type of leukemia, accounting for about 15% of cases of acute lymphoblastic leukemia (ALL). Thus, B-ALL is the most common type of ALL.