Prereading, Reading, and Review
93 students play instruments. 30% is equivalent to 0.3 so when multiplied by 310,(the number of kids in the entire grade,) it becomes 93.
The correct answer would be to someone reading the play. The description in brakets serves to set the scene and give more information about the story. This additional information is vital for stage designers, sound designers, director, producer an other involved in the production of the play.
The answer you have selected makes the most sense