Answer
$
\begin{aligned}
& \left(M_A\right)_C=768 \mathrm{lb} \cdot \mathrm{ft} \\
& \left(M_A\right)_B=636 \mathrm{lb} \cdot \mathrm{ft}
\end{aligned}
$
Clockwise
Work Step by Step
$
\begin{aligned}
& \left.↺+\left(M_A\right)_C=80\left(\frac{4}{5}\right)(12)=768 \mathrm{lb} \cdot \mathrm{ft}\right) \\
& \left.↺+\left(M_A\right)_B=50\left(\cos 45^{\circ}\right)(18)=636 \mathrm{lb} \cdot \mathrm{ft}\right) \\
& =\left(M_A\right)_B
\end{aligned}
$
Since $\left(M_A\right)_C>\left(M_A\right)_B$
Clockwise
