Select the most appropriate option to substitute the bracketed segment in the given sentence. If there is no need to substitute it, select 'no substitution required’.

The unit twitched like a bird (preening it's plumage and becomes motionless). 

1
preening its plumage and became motionless 
2
No substitution required 
3
preening it's plumage while becoming motionless 
4
to preen it's plumage and becomes motionless 

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