Problem $3$

The below pile cap has five piles as shown with a vertical load applied to it $P=150$kip and a moment in the $x-y$ direction as shown of $M_{xy}=75$kip.$ft.$

the minimie pire capacity of $Q_{?}=40$kip, most ne dimension $b$ between piles is

$($A$)35$ in

$($B$)70$ in

$($C$)105$ in

$($D$)140$ in