A common mistake most beginner salespeople make is speaking in a certain kind of voice that makes people lose interest in their sales presentation and makes it unlikely that they’ll buy a product or service. What is this certain kind of voice called?

A. high pitched
B. enthusiastic
C. monotone
D. baritone

C. monotone

is this right

Yes, that is correct. A monotone voice lacks variation in pitch and can be perceived as boring or unengaging, ultimately leading to a loss of interest from the audience.