A $3"$ wide by $12"$ high simple beam carries a uniform load. The beam is made of oak with an allowable flexural stress of $1900$ psi. The maximum superimposed uniform load w in lb$/$ft that can be applied to the beam is most nearly?

Section

$w=848l\frac{b}{f}t$

$w=912l\frac{b}{f}t$

$w=931l\frac{b}{f}t$

$w=887l\frac{b}{f}t$