In the Study of the 107^th Congress by Howell and Colleagues

In the study of the 107^th Congress by Howell and colleagues, how did ideological movement in the House compare to ideological movement in the Senate?

A) Movement in the Senate was concentrated among Republicans while in the House both parties shifted to the left.
B) Movement in the House was concentrated among Republicans while in the Senate both parties shifted to the right.
C) Movement in the both houses was concentrated among Democrats and both parties shifted to the right.
D) Movement in the House was concentrated among Democrats who shifted left while in the Senate Republicans shifted to the right.