An Oral Disorder Occurring Most Often on the Lip Is

An oral disorder occurring most often on the lip is associated with smoking or chewing tobacco in 80% of those suffering from the condition.Which best describes this disorder?

A) It occurs during the childbearing period.
B) Its cause is well understood.
C) It is a complication of bacterial infections.
D) It is called oral cancer.
E) Antibiotics will clear it up.