***** NOT A TEACHER *****
Hello, Ms. Verdu Menarguez:
If I had taken the test, I would have gone for D. (crossing - ferry)
My reasoning:
1. I have read that the distance between Dover and Calais is very short.
2. Because of its short distance, I would not feel comfortable using "voyage" or "cruise." (At Dover, do people yell "Bon Voyage"? One can cruise around the world, but surely not between Dover and Calais.)
3. I remember reading that before they built the tunnel under the English Channel, people and cars and trains used a ferry to cross the Channel. (I still have a photograph of the night train from London being shunted onto the ferry. Ah! The old days!)
4. "Trip" is not too bad, but it's matched with "yacht," which I think is out of the question.
5. I had to choose D because I thought that a short hop across the Channel would not involve a "luxury ship" or "a luxury liner."
James