6990. The notice said that the meeting would begin precisely at 9.00 a.m.

✅ The correct answer is option C.
Concisely : in a way that is brief but comprehensive.

Approximately : used to show that something is almost, but not completely, accurate or exact; roughly.

Exactly : used to emphasize the accuracy of a figure or description.

Inaccurately : in an incorrect or inexact manner.

Precisely : in exact terms; without vagueness.

Synonym of Precisely is Exactly