jwms Wrote:How do we know what the French gov't knew? As the original poster here wrote, perhaps the French did know of a source, but it wasn't a worthwhile source, and so they decided to develop another method. The fact that this answer choice writes about the gov't's knowledge is what turned me away.
We don't actually, and we don't have to
Inference questions can ask us to either pick an answer that must be true, or for an answer that is the most provable. This question happens to fall into the latter.
You're doing an awful lot of reasoning to justify why (B) should be eliminated. A LR should never have to make you work that hard and compel you to make so many unwarranted assumptions (i.e. that pursuing another source wasn't worthwhile).
Be very wary of answer choices like (D) that broaden the scope and generalize from just a simple, singular example.