Final answer:
U.S. LNG exports are projected to be 9.2 trillion cubic feet with high oil and gas resources and technology, versus 2.5 trillion cubic feet with low resources and technology, yielding a difference of roughly 6.7 trillion cubic feet.
Step-by-step explanation:
The student's question pertains to the future projections of the U.S. liquefied natural gas (LNG) exports under different scenarios of resource and technology levels by the year 2030. To calculate the difference between high and low scenarios of LNG exports, we simply subtract the lower estimate from the higher estimate.
If we have high oil and gas resources and technology, U.S. LNG exports are expected to be about 9.2 trillion cubic feet. In contrast, with low oil and gas resources and technology, the exports are expected to be around 2.5 trillion cubic feet. The difference between these two scenarios would therefore be 6.7 trillion cubic feet (9.2 - 2.5 = 6.7), which is not precisely one of the provided options. However, based on the closest presented options, we might infer a difference of about 6.2 trillion cubic feet (if we assumed the figures were approximate). It is worth noting there seems to be a discrepancy in the provided information and the student should be made aware of this.