Gold is a precious metal that is highly valued for its properties and uses. It is a dense, soft, shiny, malleable, and ductile metal. Gold is also a good conductor of electricity and is resistant to corrosion and tarnish. These properties make gold an ideal commodity for storage as it does not require special conditions or maintenance. Furthermore, gold is highly liquid and readily available, which means that investors can easily purchase gold for delivery at the maturity of the contract. This reduces the need for storage and consequently, the storage costs. In comparison to other commodities like crude oil, corn, and livestock, gold has the smallest storage costs. Crude oil requires special storage facilities to prevent leakage and environmental damage. Corn is a perishable commodity and requires conditions that prevent spoilage. Livestock requires feed, care, and suitable living conditions. All these factors contribute to their higher storage costs.

Choice A is incorrect. Crude oil incurs significant storage costs due to the need for specialized storage facilities that meet safety and environmental regulations. Additionally, the cost of insuring these facilities can also be substantial.

Choice B is incorrect. Corn, being a perishable commodity, requires controlled environments for storage to prevent spoilage and infestation. This results in high storage costs.

Choice C is incorrect. Livestock also incurs high storage costs as it requires feeding, care and appropriate living conditions which are expensive to maintain over time.