The maximum value of the magnitude of the differences of two vectors $\overrightarrow{\mathrm{P}} \mathrm{and} \overrightarrow{\mathrm{Q}}$ can be

• A

  P+Q

• B

  P-Q

• C

  $\sqrt{{\mathrm{P}}^2+{\mathrm{Q}}^2}$

• D

  $\sqrt{{\mathrm{P}}^2-{\mathrm{Q}}^2}$