A cancerous tumor arising from a glandular organ is a/an:

A) carcinoadenoma.
B) adenocarcinoma.
C) astrocytoma.
D) glioma.

Adenocarcinoma is a cancerous tumor that develops from glandular tissue, which is present in organs such as the breast, prostate, and lung. Carcinoadenoma is not a commonly used term and is not as specific as adenocarcinoma in describing the type of tumor. Astrocytoma and glioma are types of brain tumors and do not arise from glandular organs.