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Blood group 'O' is universal donor, also its antibodies are A & B. e.g: if blood from O+ is transfered to A+ , then wont antibody of O (A & B) react with the antigen A?

Your friend has answered correctly but I would like to add few points in the answer- Blood group O- is the universal donor. According to your question if oa person with O+ bood group donates blood to A+ then no clumping will takes place. Antibodies are produced in response to antigen and O blood group do not contain any antigen. 

@Brij:- Good answer, keep posting!!

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Antibodies are substances that are produced by our bodies in response to antigens(foreign particles).Our body does not contain antibodies all the time.It makes them when it recognises an antigen , so in general a person with blood group O does not have antibodies present in him at the time of blood transfusion and thus it wont react.When we say a person has 'a' antibody => he will make  'a' antibody in response to 'a' antigen.

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if blood group o+ given to a persion of A+ then the antibody of O{A,B} does not react with antigen A because blood group O+ is universal donor for + groups not for other otherwise it started clotting that is harmful to us

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