Choose the alternative which best expresses the meaning of the highlighted idiom/phrase.
He sold his house for a $song$.

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We should $give\, a\, wide\, berth$ to bad characters.

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The university will have to $shelve$ its plans for expansion in view of the present situation.

Choose the alternative which best expresses the meaning of the highlighted idiom/phrase: "Don't $thrust\, your\, nose$ into my affairs."

Some idioms/phrases are given below together with their meanings. Choose the correct meaning of the idiom/phrase: "To smell a rat".

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Though he has a lot of money,yet all his plans are $built\, upon\, sand.$