I honestly don’t think two Bs senior year will make or break your application. If you were in the accept pile, I don’t think this slight blip will change that since your acceptance was likely based on a whole package that two Bs won’t significantly change. And I would also be concerned that sending in an unsolicited explanation might do more to draw attention to the issue than to quell it. But definitely seek other input on the matter. Ultimately, it will be your decision.
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