Answer:
The correct answer is 4. The big, brown dog sat next to the couch and chewed a bone.
Step-by-step explanation:
An adjective is a word used to describe something, for instance, in this context the adjectives used in the correct option which is number 4 are: big and brown. And they are used to describe the dog.
The first option, has an adverb: loudly, which is used to describe how the dog is chewing the bone, however, most words ending with the suffix –ly, are considered adverbs, not adjectives. On the other hand, options 2 and 3 do not describe anything.