What is the decreasing order of strength...

What is the decreasing order of strength of the bases `OH^(-),NH_(2)^(-),HC-=C^(-) and CH_(3)CH_(2)^(-)`?

A

`CH_(3)-CH_(2)^(-) gt NH_(2)^(-) gt H-C-= C^(-) gt OH^(-)`

B

`H-C -= C^(-) gt CH_(3),- CH,_(2)^(-)gt NH_(2),gt OH^(-)`

C

`OH^(-) gt NH_(2)^(-) gt H-C -= C^(-) CH_(3)-CH_(2)^(-)`

D

`NH_(2)^(-) gt H-C^(-) gt OH^(-) gt CH_(3)-CH_(2)^(-)`

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The correct Answer is:

A

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