Final answer:
Broker B needs separate permission from the seller to sell the house.
Step-by-step explanation:
Option 1: Broker B needs separate permission from the seller to sell the house.
In a real estate transaction, the seller typically appoints a broker (in this case, Broker A) to help sell their property. The broker then has the authority to engage other brokers, such as Broker B, to assist in the sales process. However, for Broker B to actively participate in selling the house, they would need separate permission from the seller in addition to the permission granted to Broker A. This is because both buyers and sellers in a market can act independently and compete with each other.
Hence, Option 1: Broker B needs separate permission from the seller to sell the house is true.