The length of the perpendicular drawn from the point (4, -7, 3) on the y-axis is

From the given question point (4, -7, 3).
The foot of perpendicular on y-axis should be (0, -7, 0)
Now, the distance between two points can find as following
$\sqrt{{(4 - 0) }^2+ (-7 - {(-7)) }^2+ {(3 - 0) }^2} = = \sqrt{4^2+3^2} = \sqrt{25}=5$
Therefore, length is 5. Which is option (C)