Concept:The words are placed in the wrong positions in the sentence. We need to find which pairs must be interchanged to make the sentence grammatically and contextually correct.
Explanation:In the given sentence, "band" refers to a group of musicians, so it can be hired for an event.
"Wedding" is the event itself, so it should come after "For their".
Hence, positions A and B must be swapped.
Now, "dance" is an action that a person performs, so it should follow "wanted to".
"Long" describes the duration of the night, so it should come before "all-night".
Therefore, positions C and D must also be swapped.
After interchanging A-B and C-D, the correct sentence is: "For their wedding, they hired the best band as they wanted to dance all night long."
This sentence is both grammatically and contextually correct.
Thus, the required combination is A-B and C-D, which is given in option A.
Answer:Option A — A-B and C-D