The meeting was adjourned after discussing on the matter for about two hours.

The correct answer is A. postponed.

To adjourn means to suspend a meeting until a later time. The meeting was adjourned after discussing the matter for about two hours, which means that the meeting was stopped and will resume at a later date.

The other options are incorrect because they do not accurately describe what happened in the meeting.

• Option B, stopped, is incorrect because the meeting was not stopped permanently. It was only
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  stopped temporarily and will resume at a later date.
• Option C, begun, is incorrect because the meeting was already in progress when it was adjourned.
• Option D, reviewed, is incorrect because the meeting was not a review. It was a discussion of a matter.