Observe the following reactions
The order of reactivity of $\mathrm{x}, \mathrm{y}, \mathrm{z}$ towards $\mathrm{S}_{\mathrm{N}} 1$ reaction is

• A

  $x>z>y$
• B

  $x>y>z$
• Correct answer
  C

  $y>x>z$
• D

  $y>z>x$

Hence, the correct answer is option: 'C'.