Question: A 60yrs. old man, smoker, uses dentures with a friable ulcer

A 60yrs. old man, smoker, uses dentures. He developed a friable, painful ulcer on his lower alveolar margin for the last one month. He gets much pain when he uses his ill-fitting dentures. Which of the following is the cause for developing the ulcer?
a) Sq. cell carcinoma ans
b) Apthous ulcer
c) Ulcer due to hi ill-fitting dentures
d) Poor oral hygiene
e) Vascular malformations