If $f'(x) = 6x^2+2,$ find $f(x)$, given that $f(x) = 7$ when $x=1$

Question

$(A)\; 2x^3+2x+3$
$(B)\; x^3+x+3$
$(C)\; 6x^3+2x+3$
$(D)\; 6x^2+2$