The correct answer is D. The meeting was presided over by the Prime Minister.
The word “preside” means to be in charge of a meeting or event. The word “over” is used to indicate that someone is in charge of something. In this case, the Prime Minister was in charge of the meeting, so he presided over it.
The other options are incorrect because they do not make sense in the context of the sentence. The word “on” is used to indicate location, so it would not make sense to say that the Prime Minister presided on the meeting. The word “upon” is used to indicate a cause or reason, so it would not make sense to say that the Prime Minister presided upon the meeting. The word “up” is used to indicate movement, so it would not make sense to say that the Prime Minister presided up the meeting.