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The equation of change in moment equals the area under the shear diagram is not applied when?

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The equation of change in moment equals the area under the shear diagram is not applied when?

(a) Rotational moment

(b) Bending moment

(c) Total weight

(d) A concentrated force acts

The question was posed to me in unit test.

I need to ask this question from Relation Between Distributed Load, Shear and Moment in portion Internal Forces of Engineering Mechanics

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Correct choice is (d) A concentrated force acts

Explanation: As this is done with the help of distributed load method thus when a concentrated load is applied this equation is not valid. This is done on the very small part of the beam. That is the minimal section of the beam is to be considered and then the application of the equilibrium equations are done so as to calculate the final result.

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