Answer:
Newton's second law is that the acceleration of an object is directly related to the net force and inversely related to its mass. Acceleration of an object depends on two things, force and mass.
Sex ratio is the difference between males and females in a population. In China, sex ratio is an issue because of how favored males are. There is cases of femicide and girls are usually put up for adoption leading to an unbalanced sex ratio.
B and D are the correct answers.
C is the answer, i know this is late but it can at least help some one else maybe
