An Aluminum Light Pole Weighs 4300 N and Supports an Arm

An aluminum light pole weighs 4300 N and supports an arm of weight 700 N, with the arm center of gravity at 1.2 m left of the centroidal
Axis of the pole. A wind force of 1500 N acts to the right at 7.5 m above
The base. The pole cross section at the base has an outside diameter of
235 mm and thickness of 20 mm. The maximum compressive stress at the
Base is approximately: (A) $16 \mathrm{MPa}$
(B) $18 \mathrm{MPa}$
(C) $21 \mathrm{MPa}$
(D) $24 \mathrm{MPa}$