Final answer:
Seller B should reduce the price to $300,000.
Step-by-step explanation:
When Buyer A indicates to Seller B that they want to purchase B's property for $300,000 and B responds by offering to sell for $350,000, the correct option at this point is Option 2: Seller B should reduce the price to $300,000. This is because Buyer A initially offered a price and Seller B countered with a higher price. If Seller B is willing to sell for the original price offered by Buyer A, they should reduce the price to $300,000.