Final answer:
The correct correction for the sentence is to change 'quick' to 'quickly' to properly use the adverb form, modifying the verb 'agree'. All other suggested corrections are unnecessary.
Step-by-step explanation:
In the provided sentence, the correct correction to make would be: A. Change quick to quickly. The reason behind this is that adverbs modify verbs, adjectives, or other adverbs, and should typically end in -ly when they modify a verb to explain how something is done. In the sentence provided, quick should be an adverb modifying the verb agree, hence it should be quickly to be grammatically correct.
The other suggested corrections are not necessary. B. The comma after couch appropriately separates two independent clauses connected by the conjunction about, so it should be kept. C. Changing friends' to friends would suggest plural friends without possession, which is incorrect given the context implies a ranch belonging to the friends. Finally, D. There is no need to capitalize ranch as it is not a proper noun in this context.