The adverb that, if substituted for "over and over again", would have the most intense or emotionally charged connotations is:
C. Relentlessly
The reasons for our choice above are the following:
- "Over and over again" indicates the repetition of an action.
- However, the question is not asking us to merely substitute the phrase for a synonym adverb. We must find an adverb that conveys intensity.
- Adverbs "repeatedly", "persistently", and "regularly" all indicate the repetition of an action. But that is all. They are not emotionally charged adverbs.
- On the other hand, "relentlessly" not only indicates repetition but also some harshness, some severity.
Therefore, with the information above in mind:
- We can conclude that the best option is letter C. relentlessly.
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