Which option must be placed between a coordinate adjectives

The word "and" must be placed between coordinate adjectives.

For example:
- She has beautiful and long hair.
- He is a tall and handsome man.
- The cat is small and fluffy.

In these examples, "beautiful" and "long" are coordinate adjectives describing the hair, "tall" and "handsome" are coordinate adjectives describing the man, and "small" and "fluffy" are coordinate adjectives describing the cat.

When using multiple adjectives to describe a noun, a comma should be placed between coordinate adjectives. This comma is known as a coordinate or serial comma. It helps to separate the adjectives and clarify that each one independently modifies the noun.

When using multiple adjectives to describe a noun, it is important to determine whether the adjectives are coordinate or non-coordinate. Coordinate adjectives are adjectives that can be rearranged or separated by the word "and" without changing the meaning of the sentence. Non-coordinate adjectives, on the other hand, do not have this flexibility.

If the adjectives are coordinate, you need to decide whether to use a comma or the word "and" between them. The general rule is to use a comma between coordinate adjectives. However, if you can insert the word "and" between the adjectives and the sentence still makes sense, then you have the option to use either a comma or the word "and" between them.

For example:

- The tall, slender woman (comma used)
- The tall and slender woman (word "and" used)
- The tall woman (no comma or "and" needed because there is only one adjective)

So, in conclusion, the option that must be placed between a pair of coordinate adjectives is either a comma or the word "and", depending on the desired style or emphasis.