Here is the item again:

Mrs. Neal loves chocolate cake. (A) But couldn't accept the slice that her student Michael offered (B) because she knew that it was a bribe (C) for a better grade on his midterm essay.

You correctly realized that the period after cake creates a problem. But couldn't accept the slice ... is a lonely verb fragment. When you attach a phrase of this type to the end of a main clause, you need no punctuation.

To fix the problem, you chose to do this:

Mrs. Neal loves chocolate cake but couldn't accept the slice that her student Michael offered because she knew that it was a bribe for a better grade on his midterm essay.

You have correctly employed Punctuation Rule 8:

Main Clause + Ø + Lonely Verb Phrase.

What an intelligent decision!

Go to the next sentence.

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