The correct option is C 1 & 2
Binomial is a polynomial with two terms.
p(x)=x+1 and q(x)=x3+x are the polynomials in the given options that have only 2 terms. Thus, they are binomials.
The other polynomials r(x)=√2+x+x2 and r(u)=u+u2−2 have 3 terms, which implies that they are not binomials.