10 POINTS + BRAINLIEST ANSWER!!

Let the polynomials f and g be defined by f(x) = 3x^3 + 6x^2 + 11x and g(x) = 8x^2 + 15x + 7. Which of the following polynomials is divisible by 3x + 7?

A. j(x) = 2f(x) + g(x)

B. k(x) = f(x) + g(x)

C. m(x) = f(x) + 2g(x)

D. n(x) = f(x) + 3g(x)