Saroj,a 32 year old female,from rural background presented with a h/o chronic tobacco chewing since 14 year of age.Now she has difficulty in opening her mouth.On oral examination,no ulcers are seen.Most probable diagnosis is:

• A. Submucous oral fibrosis
• B. Carcinoma of buccal mucosa
• C. TM joint arthritis
• D. Trigeminal nerve paralysis