Which of the following best describes the
conditions on integer coefficients a, b, m,
and n for the sum of ax2 +b and
mx2 + nx to be linear?

A.Coefficients a and m must have
opposite values.

B.Coefficients a and m must
have the same value.

C.Coefficients a and n must have
opposite values.

D.Coefficients a and n must have the
same value.