The bear commonly performing on streets is

Sloth bear
Sun bear
Brown bear
Cat bear

The correct answer is (a) Sloth bear.

Sloth bears are the smallest of the eight bear species in the world. They are found in the tropical forests of India, Sri Lanka, and Nepal. Sloth bears are solitary animals and are active at night. They are omnivores and their diet consists of fruits, insects, honey, and small mammals.

Sloth bears are not commonly used in street performances. However, there have been reports of sloth bears being used in circuses and other forms of entertainment. This is illegal and harmful to the bears. Sloth bears are not domesticated animals and should not be kept in captivity.

The other options are incorrect.

(b) Sun bears are the smallest of the eight bear species in the world. They are found in the tropical forests of Southeast Asia. Sun bears are solitary animals and are active at night. They are omnivores and their diet consists of fruits, insects, honey, and small mammals.

(c) Brown bears are the most common bear species in the world. They are found in North America, Europe, and Asia. Brown bears are solitary animals and are active at night. They are omnivores and their diet consists of plants, fruits, insects, small mammals, and fish.

(d) Cat bears are not a real species of bear. They are a fictional creature that is often used in children’s stories. Cat bears are said to be small, furry bears that have the body of a cat and the head of a bear.