Why Is It Important for Teachers of Mathematics to Possess

Why is it important for teachers of mathematics to possess a solid understanding ofmathematical content?

A) Research shows that teachers with the best understanding of mathematics alsopossess the most positive dispositions toward mathematics.
B) Research shows a strong correlation between teachers with solid mathematicsbackgrounds and the achievement of their students.
C) Research shows that mathematical content knowledge affects decisions made byteachers.
D) Research shows that there is a correlation between teachers with strong contentknowledge and the use of appropriate questioning techniques.
E) Research shows that teachers with weak mathematical backgrounds tend not tostay in the profession for more than five years.