The correct option is
A teach
To “teach” means to
impart knowledge to or instruct someone as to how to do something, person who teaches is called a teacher, hence Option B is the correct answer because according to the statement, the teacher is being spoken about. Option A is incorrect because “to run” means to move very quickly, which is incorrect here because the teacher is being spoken about in the class, hence running is not of the same context.
Option C is incorrect because to “read” means to look and comprehend at something, which is not correct here because the teacher’s ability to read doesn’t depend on the discipline in the class.
Option D is incorrect for the same reason as option C.