Answer:
c
Explanation:
Because it is expected that the price of gold would fall next month, buyers would buy less gold in January. this would lead to a leftward shift of the demand curve.
Only a change in the price of a good leads to a movement along the demand curve of that good. Also, only a change in the price of the good would lead to an increase or decrease in the quantity demanded of that good.
Other factors other than the change in the price of the good would lead to a shift of the demand curve. Some of those factors include :