​Three possibilities are equally likely and have payoffs of $3,$6,and $9.The expected value is:

A) ​$4
B) $5
C) $6
D) ​$7

According to your textbook,proofreading is

A) unnecessary for digital communication.
B) the quality inspection stage for a document.
C) a casual scan up and down the page or screen.
D) something you do immediately after finishing a document.