Agreement or concord happens when a word changes form depending on the other words to which it relates. It is an instance of inflection, and usually involves making the value of some grammatical category "agree" between varied words or parts of the sentence.
It could be due to stress. Everyone deals with stress differently. Usually they are mad at themselves, like they have failed at supporting and that can lead to depression also.
Answer: C. Communication accommodation theory.
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Explanation: