【单选题】The static ally determinate beam with centralhinge is shown in the figure. If the concentrated couple M is moved from the right side of the hinge C to the left side,.
A.
the Q diagram of the beam remains unchanged and the M diagram changes
B.
the M diagram of the beam remains unchanged and the Q diagram changes
C.
both the Q and M diagrams are changed
D.
both the Q and M diagrams are unchanged