Zeynep: I watched a documentary about wild animals last night. It showed how elephants communicate with each other.
Mert: Really? I thought they only made trumpeting sounds.
Zeynep: No, they also use infrasound that humans cannot hear.
Mert: That's amazing! So they have a secret language.
According to the conversation above, which of the following is true?
A)Zeynep thinks elephants only communicate through sounds humans can hear.
B)Mert learned that elephants can communicate in ways humans cannot detect.
C)Elephants cannot produce sounds that humans can hear.
D)Zeynep and Mert agree that elephants are the loudest animals.