For the formula g = mg, the correct understanding is A. An object with a mass of 1kg weighs 9.8N B. The weight of a thing is 9.8 times its mass C. The weight g is proportional to g D. The weight g is proportional to M

For the formula g = mg, the correct understanding is A. An object with a mass of 1kg weighs 9.8N B. The weight of a thing is 9.8 times its mass C. The weight g is proportional to g D. The weight g is proportional to M

A is wrong, because the gravity constant G is different in different places. 1kg is not necessarily 9.8N
B no, weight and mass are two completely different parameters. You can't say who is who, how many times. Have you ever seen someone say how many times height is weight
C is not right. G is a constant. It is not proportional to any quantity
The answer is D, but in some cases you need to add a, such as the limit of G = 9.8n/kg