Which of the following affects the market price of a property?

The correct choice highlights the influence of current interest rates on the market price of a property. Interest rates play a significant role in the real estate market as they directly impact a buyer's affordability and willingness to purchase property. When interest rates are low, borrowing becomes cheaper, leading to an increase in demand for properties since more buyers can secure loans for larger amounts. Conversely, if interest rates rise, the cost of borrowing increases, which can decrease buyer demand and subsequently lower property prices in the market.

The other choices, while they may have their significance in a property transaction, do not exert the same instrumental and broad-reaching effect on the market price as interest rates do. For instance, location and square footage are key factors in determining a property’s value, but they do not fluctuate in the same economically responsive way that interest rates do on a larger scale. High-pressure sales tactics may influence individual buyer behavior in specific transactions, but they do not affect the fundamental market forces that dictate overall property values.