The combining form that relates to the mouth is c. stomat(o).
In medical terminology, various organs are named after certain root verbs. The root verbs form names for organs which are used by specialists commonly.
In medical terminology, the combining form that relates to the mouth is stomat(o) hence option c is correct.
Option a is incorrect because intestin(o) is not a correct combining form. The combining form for the small intestine is enter(o) and for the large intestine is col(o).
Option b is not correct as esophag(o) is the form related to the esophagus.
Option d is not correct because gastr(o) is the combining form related to the stomach.
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