Final Answer:
The buyers are not legally obligated to purchase the house. Option D is answer.
Step-by-step explanation:
Initial Offer and Counteroffer:
Buyers offered $250,000 including dining room furniture.
Sellers countered with $250,000 excluding the furniture.
Counteroffer Extinguishes Original Offer:
The sellers' counteroffer effectively cancelled the original offer.
This is a common principle in contract law.
New Offer Requires Acceptance:
The revised offer from the sellers on Friday is a new offer.
The buyers are free to accept or reject this new offer.
No Obligation Without Acceptance:
Since the buyers haven't accepted the new offer yet, they are not legally obligated to purchase the house.
Therefore, the correct answer is D. They are not legally obligated to purchase the house.