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What is the reason behind dropping down of Ea with load?

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What is the reason behind dropping down of Ea with load?

(a) Field resistance

(b) Load resistance

(c) Internal factors

(d) Armature reaction

I got this question in an interview for job.

My question is taken from Characteristics of Separately Excited Generators in chapter DC Generator of DC Machines

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Right answer is (d) Armature reaction

Explanation: In spite of fixed excitation, Ea drops off with load owing to the demagnetizing effect of the armature reaction. As the voltage drop is caused by magnetic saturation effect, it increases with load non-linearity.

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