On a number line, points A, B, and C are placed such that:

- Point A is at −8
- Point B is twice as far from 0 as point A.
- Point C is halfway between points A and B

Quantity A = The distance between points B and C

Quantity B = 4

Ans is D. Source is Gregmat quant flashcard quiz 1. please explain the answer… i could not understand measurement about point B.