Which influence will shift the supply curve?

Question

Quizplus · Accepted Answer

Expectations of a future decline in prices will shift the supply curve to the right, as producers will want to sell more in the present before prices fall in the future. 
All of the other choices would shift the demand curve. A rising popularity of a product and an increase in the incomes of consumers would increase demand, shifting the curve to the right. An increase in population would also increase demand if the population is more likely to consume the product, shifting the curve to the right.

Which Influence Will Shift the Supply Curve