Which of the following is the most stable compound?

• A

  ${\mathrm{Ph}}_3\stackrel{+}{\mathrm{C}}$

• B

  ${\mathrm{Ph}}_2\stackrel{+}{\mathrm{CH}}$

• C

  ${\mathrm{Ph}}_2\stackrel{+}{\mathrm{C}}{\mathrm{H}}_2$

• D

  $\mathrm{Ph}{\stackrel{+}{\mathrm{CH}}}_2$