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Let f:[0'1] to [-1,1] and g:[-1,1] to [0...

Let `f:[0'1] to [-1,1]` and `g:[-1,1] to [0,2]` be two functions such that g is injective and `g^(@) f:[0,1] to [0,2]` is surjective. Then

A

f must be injective but need not be surjective

B

f must be surjective but need not be injective

C

f must be bijective

D

f must be a constant function

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