The word retained has various meanings, from the given 5 sentences, the meaning of retained is to kept in mind or remembered. Option D is correct.
The term “Retained” simply means to keep the possession of anything, to keep anything in the human mind. It is used to keep some fact in the mind or to remember.
The another meaning of retained is to absolve, means to absolve something in the human mind or to absolve something in some object.
Example:
In the annual function of a school, teacher gave some instructions to the volunteers to remember in the night dance function and students retained the instructions means that the students remember the instructions of the teacher.
Therefore, option D is correct, that the best meaning of retained is to keep in mind or to remember.
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