Test analysis: to examine students' ability to read and obtain effective information. According to the materials, due to the intervention of a large amount of funds, the price of gold rebounded from a low level, indicating that demand affected the price, and people's speculation intensified the fluctuation of the price of gold, so C met the question. A is inconsistent with the meaning of the question, and B is wrong. The essence of money is universal equivalent. D wrong, use value is not the main factor affecting commodity prices, but value is the basis of prices.