Ais a long tubular handle with a thick retractable wire inside it.
a. muzzle
b. training collar
c. slip leash
d. head snare

d. head snare

Explanation:

Head snare is a type of bimembranophone drum composed of a small section cylindrical body, with two skins attached and tensioned by metal hoops, a thick retractable wire, a metal mat consisting of small wire springs placed in contact with the Lower skin, which vibrates through the resonance produced whenever upper skin is struck, producing a peaking sound.

diagram is missing, but i will try to explain your doubt.

answer:

amplitude is the maximum displacement or distance moved on a point of a vibrating body or wave measured from its equilibrium position.it is equal to half the length of vibration path.

the answer would most likely be c, because if it's a comical piece of information, it may likely not be true, if it's a site that allows anybody to edit the content, it could mean a five year old is typing the info, and if it's a tv show produced by a celeb, it may have a biased opinion.