What is the lower limit of frequency of human hearing?

Which of the sounds having the following frequencies can be heard by the human beings and which cannot?

(a) 6 hertz

(b) 5000 hertz

(c) 10000 hertz

(d) 35000 hertz

(e) 18kHz

What is the upper limit of frequency of human hearing?

Name one animal which can produce ultrasonic sounds.

Name two animals which can hear ultrasonic sounds.