PT 54 S1 Q11

Passage A      Drilling fluids, including the various mixtures known ... ...

Based on information in the passages, which one of the following, if true, provides the strongest support for a prediction that the proportion of oil-well drilling using OBMs will increase in the future?
(A) The cost of certain ingredients in WBMs is expected to increase steadily over the next several decades.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Practice Set: Comparative Reading