Answer
(B)
Work Step by Step
A line in slope-intercept form has the equation:
$y=mx+b$ ($m=slope$, $b=y-intercept$)
We convert the line equation to slope-intercept form:
$x-3y=3$
$-3y=3-x$
$y=(3-x)/-3$
$y=-1+\frac{1}{3}x$
$y=\frac{1}{3}x-1$
So the line has a $y$-intercept of -1 and a positive slope. Only (B) matches these properties.