In conclusion, dolphins need open space because at sea, dolphins are always on the move, often traveling hundreds, sometimes thousands of miles. Their large brains likely help them to succeed in foraging on widely scattered and temporarily available resources. Dolphins, like some other animals, are essentially complex social mammals that need expansive space to live in. A tank can’t even begin to address these needs…
B. It shows where the previous sentence's information is from.
I would say D, as it would allow the reader to understand the comparison being made
Explanation:
, I happened to visit Kathmandu. I decided to go by air. I booked my seat with Royal Nepal Airlines a week in advance of my departure. My plane take-off from IGI Airport at 10 a.m. Before the take-off, everything was checked and passengers fastened their belts. When the plane started moving on the runway, there was a terrific noise. But in no time, it take-off. This was my first air trip. As the plane was flying, I felt a little giddy. My ears seemed to be swelling. But after some time. I began to feel normal.
