a cows head goes through this device which swivels to close against the cows neck. select the best option…

Brief Explanations:

A headgate is a device in livestock handling where a cow's head goes through and it swivels to close against the cow's neck to restrain the animal for various procedures like milk - ing or medical treatment. A stanchion is more of a stationary post or structure for holding an animal in place. A gate is a more general barrier and a chute is a passageway for guiding animals.

Answer:

B. Headgates