Annie wants to arrange her science, English, and math text books in a row on a shelf. Which tree diagram best shows the sample space of all the possible ways to arrange the three books in a row on a shelf, where S is science, E is English, and M is math?

A tree diagram is shown. The lines branch out to S, E, and M. In the first row, the lines branch out from S to E to M and from S to M to E. In the second row, the lines branch out from E to S to M and from E to M to S. In the last row, the lines branch out from M to E to S and from M to S to E.
A tree diagram is shown. The lines branch out to S, E, and M. In the first row, the lines branch out from S to S to M and from S to M to E. In the second row, the lines branch out from E to S to M and from E to M to S. In the last row, the lines branch out from M to M to S and from M to S to E.
A tree diagram is shown. The lines branch out to S, E, and M. In the first row, the lines branch out from S to E to M and from S to E to E. In the second row, the lines branch out from E to S to M and from E to M to E. In the last row, the lines branch out from M to E to S and from M to S to E.
A tree diagram is shown. The lines branch out to S, M, and E. In the first row, the lines branch out from S to E to M and from S to M to E. In the second row, the lines branch out from M to S to M and from M to E to S. In the last row, the lines branch out from E to S to M and from E to S to E.