Sam Works for a Major Oil Company and in a Discussion

Sam works for a major oil company and in a discussion with a friend stated that it was time to make a career switch to the natural gas industry. When asked why, he explained that the stores of natural gas are estimated to be approximately 4,000 trillion cubic feet whereas no major crude oil discoveries have been made in decades. What was Sam saying?

A) Peak oil production has been reached.
B) The future of energy follows the logic of economic contingency.
C) Environmentally conscious consumers are looking for cleaner fuel alternatives.
D) Natural gas represents a sociological tipping point.