The Government Has Been Trying to Encourage the Use of Fuel-Efficient

The government has been trying to encourage the use of fuel-efficient cars.One way it has been doing this has been by allowing fuel-efficient cars to use a separate highway lane.This encourages people to use fuel-efficient cars because:

A) those who place a high value on their scarce time may be encouraged to buy a fuel-efficient car to take advantage of the speedier separate highway lane.
B) those who place a low value on their scarce time may be encouraged to buy a fuel-efficient car to take advantage of the speedier separate highway lane.
C) those who are more concerned about the environment are also those who happen to place a high value on their time.
D) those who purchase a fuel-efficient car are forced to pay more for a new car, and the use of the separate highway lane compensates them for this.
E) those who purchase a fuel-efficient car are likely to be unhappy because it is less powerful or more cramped inside; use of the separate highway lane compensates them for this.