Which of the following is the best substitute for the word emit in this sentence: "The heart monitor machine was set to emit regular beeps"?

a. send out

b. register

c. calculate

d. sustain

From the given sentence above, the word that is the best substitute for the word emit is send out. The correct answer is option a. "The heart monitor machine was set to send out regular beeps". The word "emit" means to release or discharge. It is synonymous to the meaning of "send out".