Affording strategic proximity to the Strait of Gibraltar, Morocco was also of interest to the French throughout the first half of the twentieth century becuase they assumed that if they did not hold it, their grip on Algeria was always insecure.
a) if they did not hold it, their grip on Algeria was always insecure
b) without it their grip on Algeria would never be secure
c) their grip on Algeria was not ever secure if they did not hold it
d) without that, they could never be secure about their grip on Algeria
e) never would their grip on Algeria be secure if they did not hold it.
I understand the correct answer is b, because it is the "best" answer, but I'm wondering if there is a pronoun agreement error in the sentence.
The first "they" in the question sentence seems to be referring to the French, which I believe is singular. Is this actually an error on the GMAT part, because I was hung up on that throughout this question.
I've put that "they" in bold.