David, a College Senior Majoring in History, Was Concerned That

David, a college senior majoring in history, was concerned that his knowledge of history would be insufficient to teach high school. He was considering enrolling in more American history courses to prepare himself for the classroom. According to research about teacher effectiveness, what is most likely a better use of David's time as he prepares to teach?

A) Developing tests in American history for use with his students
B) Studying history from an interdisciplinary perspective so he could draw upon those other areas in his teaching
C) Learning alternative strategies for facilitating a group process in the classroom
D) Developing an understanding of the content of the school curriculum that students will be expected to know