With a sine-wave input, how will the output compare to the input in (a) a linear circuit and (b) a nonlinear circuit?
A. (a) Proportional (b) proportional
B. (a) Proportional (b) not proportional
C. (a) Not proportional (b) not proportional
D. (a) Not proportional (b) proportional
Share your understanding of this question with the correct explanation.