Choose the best option to fill the gaps in the following sentences:
Why does a flamingo stand on one leg? Because if it lifted the other one, it would ....
go down
let down
fall down
come down
get down
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Actually fall down is a phrasal verb. In this it's correctly used eg of wrong use (a)the leaves fell down during autumn. Here fell is required. So answer is correct
REF. dictionary.cambrige.org

Please,be more careful with what ya typing.
I was hesitating to pick 'C' because of the tautology & went ahead to pick B

We can use fall as a noun or a verb. It means ‘suddenly go down onto the ground or towards the ground unintentionally or accidentally’. It can also mean ‘come down from a higher position’. As a verb, it is irregular. Its past form is fell and its -ed form is fallen. Fall does not need an object:
Mrs McGrath had a terrible fall yesterday. She’s in hospital now. (noun)
Four trees fell in the storm. (verb)
Oil prices have fallen recently.
Fall down is a phrasal verb. We use it when something falls to the ground from its normal position:
The picture keeps falling down. (from the wall to the ground)
He slipped and fell down.


