What is the right answer?

Which of the following will decrease the demand for gasoline (shift the demand curve to the left)? O a. an increase in the prices of gas-guzzling SUVs O b. improvements in the provincial highway system that make cars more attractive relative to other modes of travel O c. an increase in the price of crude oil that causes the price of gasoline to rise Od. a decrease in the prices of gas-guzzling SUVs