Which option must be placed between coordnate adjectives

A comma must be placed between coordinate adjectives.

When using coordinate adjectives, you must place a comma between each individual adjective. However, there is also the option to use the word "and" between the last two coordinate adjectives instead of a comma. Both options are correct, and the choice between them depends on the specific context and desired style.

When using multiple adjectives to describe a noun, they can be placed in a specific order to maintain clarity and coherence in the sentence. This is known as the order of coordinate adjectives. Generally, adjectives can be categorized into different types based on their purpose, such as opinion, size, age, shape, color, origin, material, and purpose.

To determine the order of coordinate adjectives, you can follow the acronym "OSASCOMP." Each letter stands for a different type of adjective, and adjectives of that type should be placed in that specific order:

1. Opinion: Adjectives that describe personal opinion or judgment come first. For example: beautiful, delicious, good.
2. Size: Adjectives that describe the size of the noun come second. For example: big, small, tiny.
3. Age: Adjectives that describe the age of the noun come third. For example: old, young, ancient.
4. Shape: Adjectives that describe the shape of the noun come fourth. For example: round, square, triangular.
5. Color: Adjectives that describe the color of the noun come fifth. For example: red, blue, green.
6. Origin: Adjectives that describe the origin or nationality of the noun come sixth. For example: American, French, Asian.
7. Material: Adjectives that describe the material the noun is made of come seventh. For example: wooden, metal, plastic.
8. Purpose: Adjectives that describe the purpose or function of the noun come last. For example: cooking, sleeping, gardening.

Following this order helps create a clear and logical structure in sentences when using multiple coordinate adjectives. However, it's important to note that not all adjectives will fall into one of these categories, and not all sentences will require the use of multiple coordinate adjectives.