CR Question - Manhattan - Teachers who switch careers

Hi friends,
Can anyone please help me understand this practice problem from Manhattan CR book. I am having difficulties understanding why answer choice B is incorrect, to me answer choice B is what is asserted in the argument and hence explicitly can be inferred!

Here is argument:
Teachers who switch careers are most likely to leave the teaching profession in their third year of teaching. The majority of teachers who remain in the profession for at least seven years stick with teaching for the remainder of their careers.

Which of the following conclusions can most properly be drawn from the information above?

A) Most teachers who leave the profession do so because the work is very stressful and the pay poor.
B) A majority of teachers who leave the profession do so within three years of beginning to teach.
C) A teacher in his or her sixth year of teaching is more likely to remain in the profession than one who is in his or her third year of teaching.