A simply supported beam AB has the bending moment diagram

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A simply supported beam AB has the bending moment diagram as shown in the following figure. The beam is possibly under the action of following loads:

1. Couples of M at C and 2M at D
2. Couples of 2M at C and M at D
3. Concentrated loads of M/L at C and 2M/L at D
4. Concentrated loads of M/L at C and couple of 2M at D

Correct Option: A

Variation of moment at D = (+m) – (–m) = 2m
Variation of moment at C = (+m) = m