Correct option is D
Among the highlighted words, “many” and “might” are incorrectly placed. The correct combination of words that should replace each other in order to make the sentence grammatically and contextually correct is B-A.
So, the correct sentence after rearrangement of words would be, “A standard cruise
might
(B) only last a week, but
many (A) offer options that last a
fortnight (C) or
even (D) longer.”