What often happens to futures at the time of the crop for commodities with a specific well-defined harvest window? a) Due to defaults, investors could lose a lot of money.
b) They tend to be traded above the expected spot price at the contract's maturity.
c) They tend to be traded exactly at the expected spot price at the contract's maturity, making it difficult to profit as an investor.
d) They tend to be traded below the expected spot price at the contract's maturity.