Note that in any transformation in the form :
The parent function f(x) is translated c units to the left and d units upward. If the sign is negative, just take the opposite direction.
From the given function,
c = 6, positive
and
d = -3, negative
so the parent function is translated 6 units to the left and 3 units downward.
The answer is Choice C. left 6 units and down 3 units