In the sentence "Is Debra making supper tonight?", the coordinating conjunction that works best to connect the two parts of the sentence is "or."
Here's why:
1. "Or" is used to present a choice or alternative between two options. In this sentence, it suggests that either Debra or John will be making supper, not both.
2. If we use "and" in this context, it would imply that both Debra and John are making supper together, which may not be the intended meaning of the sentence.
3. "But" is used to show contrast or contradiction, which is not the case in the sentence given.
4. "For" is a preposition and does not function as a coordinating conjunction to connect two independent clauses in this context.
Therefore, the coordinating conjunction "or" works best in this sentence to convey the intended meaning that either Debra or John will be making supper tonight.
