Answer:
C. (3,6)
explenation
We are given that,
The point (-3,-6) is transformed by the rule .
That is, the point is reflected across y-axis and then reflected across x-axis.
That is, the rule for the transformation is (x,y) → (-x,y) → (-x,-y).
So, we get,
(-3,-6) → (3,-6) → (3,6)
Thus, the co-ordinates of the image are (3,6).
So, option C is correct.