What type of option allows the holder to sell property at a specified price before a future date?

The put option is the correct answer because it grants the holder the right, but not the obligation, to sell an underlying asset at a predetermined price (also known as the strike price) before or on a specified expiration date. This flexibility allows investors to protect against declines in the value of the asset, as they can lock in selling it at the strike price regardless of market conditions.

In contrast, a call option gives the holder the right to purchase an asset at a specified price, which is not relevant to the question since we are discussing the sale of property. A swap option is associated with the right to enter into a swap contract but does not pertain to selling property directly. A covered option typically refers to a strategy involving holding a position in an underlying asset while selling options on that asset, which again does not represent a straightforward option for selling property.