Final answer:
Real Estate Trading is the correct term for activities related to the purchase, sale, and leasing of real estate. It encompasses a variety of transactions and is a key component of the real estate industry.
Step-by-step explanation:
Activities related to the purchase and sale of real estate, including transactions for the leasing of real estate and assignments of contracts for purchase, sale, and lease of real estate is defined as Real Estate Trading. The correct option from the given choices is B. Real Estate Trading. This term captures a wide range of activities, such as buying, selling, or renting residential and commercial properties. Real estate trading is an integral part of the real estate industry, which contributes significantly to the economy by enabling the transfer of property and providing opportunities for investment and development.