Sinking of an intermediate support of a continuous beam________________?

Consider the following statements

1. reduces the negative moment at support
2. increases the negative moment at support
3. reduces the positive moment at support
4. increases the positive moment at the centre of span

A. i and 4 are correct
B. 1 and 3 are correct
C. 2 and 3 are correct
D. 2 and 4 are correct