What will NOT cause a shortage?

A.) war

B.) scarcity of resources

C.) extreme weather

D.) increase in prices

Answer: D) increase in prices

An increase in prices will reduce demand, and not supply. You could have an increase in prices due to a shortage, but price increases could also be from a number of other factors, one of which is demand increasing.

Meanwhile, war, scarcity and extreme weather all are possible factors of a shortage. So we can cross choices A, B, C off the list.