Sinking of an intermediate support of a continuous beam_____________?

1. reduces the negative moment at support
2. increases the negative moment at support
3. reduces the positive moment at center of span
4. increases the positive moment at center of span
The correct answer is?
 
A. (1) and (3)
B. (1) and(4)
C. (2 )and (3)
D. (2) and (4)