A collection of cars is called

Option A is correct. A collection of cars is called a fleet. It can be classified as a collective noun. The name of a group of similar things or animals is known as a collective noun. The noun is the name of any animal, place, person, or thing. A collective noun refers to the collection of things taken as a whole. Examples of collective nouns include group, flock, gaggle, galaxy, etc. Usually, a collective noun is specific to the group. However, some collective nouns are common for everyone, like 'group'. For example, a group of people, a group of dogs etc.