The correct answer is D. is being made.
The sentence is in the present progressive tense, which is used to describe actions that are happening right now. In this case, the announcement is being made right now, so the correct verb tense is “is being made.”
The other options are incorrect because they do not reflect the fact that the announcement is happening right now. Option A, “making,” is in the present tense, which is used to describe actions that happen regularly or repeatedly. Option B, “is making,” is in the present progressive tense, but it does not accurately reflect the fact that the announcement is happening right now. Option C, “is made,” is in the simple past tense, which is used to describe actions that happened at a specific time in the past.
Therefore, the correct answer is D. is being made.