P and Q are points on theline joining $\mathrm{A}(-2,5)\mathrm{and}\mathrm{B}(3,1)$ such that $\mathrm{AP}=\mathrm{PQ}=\mathrm{QB}$. Then, the distance of teh midpoint of $\mathrm{PQ}$ from the origin is

• A

  3

• B

  $\sqrt{\frac{37}{4}}$

• C

  4

• D

  3.5