Final answer:
The sentence is an imperative sentence, as it gives a command to hold applause. It is not declarative, interrogative, or exclamatory. The final answer is c) .
Step-by-step explanation:
The sentence "Please hold your applause until all performers have concluded their acts." is an example of an imperative sentence.
An imperative sentence gives a command or makes a request, and typically ends with a period, just like a declarative sentence, although it can also end with an exclamation point to express urgency or strong emotion. In this case, the given sentence is directing the audience to refrain from applauding until a specific condition is met, which classifies it as imperative.
We can eliminate the other options because the sentence does not state a fact (declarative), ask a question (interrogative), or express strong emotion (exclamatory).
Therefore, the must be correct option in the final answer is c) Imperative.