Which option must be placed between coordinate adjectives

No punctuation
Semicolons
Periods
Commas

Commas

The option that must be placed between coordinate adjectives is commas. When using coordinate adjectives, they should be separated by commas. For example, "She wore a beautiful, elegant dress."

When it comes to coordinate adjectives, the most appropriate option to use between them is a comma. Coordinate adjectives are adjectives that equally modify a noun, and they can be rearranged without changing the meaning of the sentence. Commas are used to separate these adjectives if they are of the same type or if they can be interchanged without altering the overall meaning of the sentence.

For example:

- "She wore a beautiful, elegant dress." (The adjectives "beautiful" and "elegant" describe the same noun, and a comma is used to separate them.)

- "It was a hot, sunny day." (The adjectives "hot" and "sunny" describe the same noun, and a comma is used to separate them.)

On the other hand, if the adjectives do not meet the criteria of coordinate adjectives (i.e., they don't modify the noun equally or can't be rearranged), other forms of punctuation may be needed. The options provided in the question (no punctuation, semicolons, and periods) are not typically used between coordinate adjectives. Semicolons and periods, in particular, would create unnatural breaks or separate the adjectives too much, affecting the flow and clarity of the sentence.

In summary, the most appropriate option to use between coordinate adjectives is a comma.