Which statement about cancer is true? A. Once in remission, cancer cannot come back.

B. Self-exams help detect cancer.

C. Increasing sun exposure decreases the risk of skin cancer.

D. All tumors are cancerous.

Ruth is 44 years old. at her medical checkup, her doctor notices that ruth's lymph nodes are enlarged. after some blood tests and a ct scan, ruth's doctor diagnoses her with ( ) , a cancer that typically starts in the lymphocytes and can spread to the bone marrow.