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) $24 \mathrm { MPa }$