$X$ is obtained by dividing $Y$ by $Z$. What are $X$, $Y$ and $Z$?
- A$X$: mass, $Y$: weight, $Z$: gravitational field strength
- B$X$: weight, $Y$: mass, $Z$: gravitational field strength
- C$X$: mass, $Y$: gravitational field strength, $Z$: weight
- D$X$: weight, $Y$: gravitational field strength, $Z$: mass