Find the derivative of f(x) given that f'(x) = 4ln(7+2x²).

A) f(x) = 4ln(7+2x²)
B) f(x) = 4ln(7+2x²) + C
C) f(x) = 4(7+2x²)
D) f(x) = 4(7+2x²) + C