U.S. and Indian workers are substitutes. What effect would an increase in the wages of Indian workers have on the demand for U.S. workers, ceteris paribus? 

a. No effect on demand, because price changes affect quantity demanded, which would fall.

b. The demand would decrease.

c. The demand would increase.

d. No effect on demand, because price changes affect quantity demanded, which would rise.

e. We cannot tell unless we know what happened to the price of U.S. workers.