(-a-b-c)^(2)=...

`(-a-b-c)^(2)=`

A

`a^(2)+b^(2)+c^(2)-2ab+2bc+2ca`

B

`a^(2)+b^(2)+c^(2)+2ab+2bc+2ca`

C

`a^(2)+b^(2)+c^(2)+2ab-2bc+2ca`

D

`a^(2)+b^(2)+c^(2)+2ab+2bc-2ca`

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