A Simply Supported Wood Beam (L = 5m)with Rectangular Cross $q=6.5 \mathrm{kN} / \mathrm{m}$

A simply supported wood beam (L = 5m)with rectangular cross section (b = 200 mm, h = 280 mm) carries uniform load $q=6.5 \mathrm{kN} / \mathrm{m}$ includes the weight of the beam. The maximum flexural stress is
Approximately: (A) $8.7 \mathrm{MPa}$
(B) $10.1 \mathrm{MPa}$
(C) $11.4 \mathrm{MPa}$
(D) $14.3 \mathrm{MPa}$