The correct option is D On the other hand, if plentiful supply is driving prices down, that is potentially better news: cheaper oil should eventually boost spending in the world’s biggest economies.
The paragraph starts saying that normally falling oil prices boost global growth, but that this time, knowing whether the lower prices reflect weak demand or increase in supply is important to discern whether there is cause for cheer.
The paragraph discusses the case of weak demand leading to lower prices, especially where the source of weakness is financial. The penultimate line talks of cheaper oil increasing the risk of deflation.
Option A- This option elaborates on the idea of deflation discussed in the penultimate line. While it is tempting to say that this option completes the paragraph best, it should be noted that the given paragraph has a structure and this option does not fit it. The paragraph has stated two possible causes for the low price- weak demand and increase in supply. If sentence A were to complete the paragraph, the case of increase in supply and how it impacts global growth will not be discussed, leaving the paragraph incomplete. Hence option A is ruled out.
Option B- It is clear this option is not the correct one, as it is irrelevant to the given paragraph.
Option C- This option, again, does not complete the given paragraph. It offers a tangential thought.
Option D- This completes the paragraph given best, as it discusses the case of lower prices caused by surge in supply of oil, the second factor stated in the “big economic question” the paragraph talks of.
Correct Answer: Choice (d)