Answer: Tilly Smith was forewarned when she saw the sea rising and also that it was forming whirlpools and bubbles as like in the video which she saw in her class of the Hawaii tsunami .

Who did not lose her parents in the tsunami?

Answer: Tilly. Option (C) is correct.

Why was Sanjeev swept away?

Sanjeev was swept away when he jumped into the water to rescue the wife of the guesthouse cook. Meghna saw relief helicopters overhead, but they did not see her. She was brought to the shore by a wave.