The diagram illustrates a solenoid through which an electric current flows. Which row compares the strength of the magnetic field produced by the solenoid at points $Y$ and $Z$ with the strength of the magnetic field at point $X$?
- Amagnetic field strength at $Y$: equal to $X$; magnetic field strength at $Z$: less than $X$
- Bmagnetic field strength at $Y$: equal to $X$; magnetic field strength at $Z$: greater than $X$
- Cmagnetic field strength at $Y$: greater than $X$; magnetic field strength at $Z$: less than $X$
- Dmagnetic field strength at $Y$: greater than $X$; magnetic field strength at $Z$: greater than $X$