Explanation
Correct answer: B.
Choice B is the best answer. The text uses a dash to introduce a nonessential element that explains the acronym FESTAC. The dash matches the dash that comes after “known,” ending the descriptive aside.
Why the other choices are wrong
Choice A
Choice A is incorrect. A colon can only come after an independent clause, which isn’t the case here.
Choice C
Choice C is incorrect. While punctuation is required to set off “or FESTAC…known” from the rest of the sentence, nonessential elements must be separated from the sentence with matching punctuation. Since a dash appears on the other side of the element, we can’t use a comma here.
Choice D
Choice D is incorrect. The descriptive aside “or FESTAC…known” is a nonessential element that must be separated with punctuation from the rest of the sentence. This choice fails to add the necessary punctuation before the nonessential element.