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Within the list shown below, the correct...

Within the list shown below, the correct pair of structures of alanine in pH ranges 2-4 and 9-11 is

A

`H_(3)N^(-)-CH(CH_(3))CO_(2)H`

B

`H_(2)N-CH(CH_(3))CO_(2)^(-)`

C

`H_(3)N^(-)CH(CH_(3))CO_(2)^(-)`

D

`H_(2)N-CH(CH_(3))CO_(2)H`

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