The sentence that contains coordinate adjectives is:
"The small cozy cabin provided a perfect retreat from the city."
In this sentence, "small" and "cozy" are coordinate adjectives that equally describe the noun "cabin." If you can put "and" between the adjectives (small and cozy) and they still make sense, they are considered coordinate adjectives.
The other sentences contain cumulative adjectives, which do not function in the same way. For example, in "bright yellow dress," "bright" describes the shade of "yellow," and they cannot be separated by "and."