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From the stability constant (hypothetical values), given below, predict which is the most stable complex?

A.

`Cu^(2+) +4NH_3->[Cu(NH_3)_4]^(2+)`,          `K=4.5xx10^11`

B.

`Cu^(2+) +4CN^-  ->[Cu(CN)_4]^- ,`          `K=2.0xx10^27`

C.

`Cu^(2+) +2en ->[Cu(en)_2]^(2+) ,`          `K=3.0xx10^15`

D.

`Cu^(2+) +4H_2O ->[Cu(H_2O)_4]^(2+) ,`          `K=9.5xx10^8`

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