Read the Following Scenario and Answer the Question Below

Read the following scenario and answer the question below.
Burning fossil fuels and their derivatives produces, among other things, harmful pollutants such as particulates, acid rain
-producing sulfur and nitrogen oxides, and carbon oxides. These air pollutants threaten ecosystems all over the world, and high carbon dioxide levels contribute to global warming. Furthermore, fossils fuels have a limited supply. The market price of fossil fuels, especially crude oil, has continued to rise in recent years. Despite this, Americans continue to consume fossil fuels at alarming rates and rely upon them for most of energy needs. At various times, the federal government has considered mandating higher fuel efficiency standards for American vehicles as a possible solution to this environmental energy crisis. Most auto manufacturers, however, are opposed to the imposition of standards.
-What factor might lead to more political support for higher fuel- efficiency standards?

A) lower oil prices
B) release of oil from the national petroleum reserves
C) an end to political instability in the Middle East
D) a greater supply of oil
E) even higher oil prices