(c)
Given area bounded by the curve, $y = \sqrt{3x + 4},x$-axis and the line $x = - 1$ and $x = 4$ is $A$ and area bounded by the curve $y = \sqrt{3x + 4}$
$ie,\ y = \pm (3x + 4)^{1/2}\ \ x$-axis and the line $x = - 1$ and $x = 4\ is\ B$
$\therefore B = 2A$
[Since, it is the area of both sides about x-axis]
$Now,\ \ \ A:B = A:2\ A = 1:2$