单选题

Why did Bala Sundar and his wife build a tree house?

A、

They themselves wanted a personal space to relax.

B、

They sent it to their kids as a gift.

C、

They could play the cello after breakfast there.

D、

They built it for Tree Top Builders.

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They eat protein.

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They never move from one location.

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They cause erosion of rocks.


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They will never be useful to people.

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