Answer :

Addition is as follows:


(a – b + ab)+(b + c – bc)+(c – a – ac)


= (a – b + ab + b + c – bc + c – a – ac)


=(2c + ab – bc – ac)


=(2c + ab – ac – bc)


Option (a) does match to our solution.


Option (b) does not match to our solution.


Option (c) does not match to our solution.


Option (d) does not match to our solution.


So, option (a) is correct answer.

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