Tubing Design: 2017 #74

Problem 74: A 16,000 ft tubing string has 5,010 psig on the tubing at surface and 10 psig on the annulus at surface. The mud weight in the tubing is 7.6 lb/gal and 8.2 lb/gal in the annulus. Which of the following statements is most FALSE? (for full wording see exam due to space limits here): (A) Collapse failure is a likely...; (B) Burst pressure is 500 psig...; (C) Collapse pressure is 6,800 psig...; (D) Burst failure is more likely...

The wording on this problem is deliberately vague. What is known: burst failure is not more likely the deeper one goes. Why? a) pumping down tbg creates higher pressure at shallower depths to overcome friction loss and b) additional string weight weakens the tbg more at shallower depth than deeper. So (D) is a first-pass answer.

But do a quick check on the other options to be safe:
(A) is possibly true as pipe is weaker in collapse.
(B) is possible since there is even currently 500 more psi delta in the tbg at surface.
(C) is possible too since that's the current pressure on the annulus at 16,000 ft, and tubing pressure is more likely to change in the future. So none of these can be "most false" when compared to (D).