Heinrich returned disappointed from a ski weekend because there was not enough snow. As he was checking out of the ski resort he commented to the owner that the resort must be losing money due to the warm weather to his surprise, the owner said no, not really, because the owner had bought a weather derivative as a hedge for these circumstances. What kind of assets generally underlie derivative contracts traded on various organized exchanges in Canada and the United States?

a. Commodities & Currencies

b. Equities

c. Interest Rates

d. All of the above