The rate or speed at which the play’s action moves is known as pace. The term pace, or also called rhythm or tempo, denotes the movement or sweep of the play as it progresses.The tempo of an entire theatrical performance is very important.
D
because it says used which is past tense
The word that goes, or better expressed, is a synonym for edge is: precipice because it has both the literal and metaphorical connotations just as edge does. It means a very steep or overhanging place, like in a cliff, and it also means to be at the brink of a situation just like edge.
The other words do not match both or any of the definitions of edge.
After reading the 2 first paragraph of the memoirs in the “Night”, it could be said that the reader gets the impression that he/she is hearing a cautionary or precocious tale about the dangers of complacency while about to face a great evil.