Answer: 1.black
Explanation:
A green object, like the leaf in this problem, absorbs all colors of light except for the green color. In fact, the object is able to reflect only the green light, and this is why the object appears green to us: because this is the only color reflected by the leaf.
Therefore, if we hit the leaf with red color, it will appear black: in fact, the leaf is will absorb the red light, and there are no more colors to be reflected - therefore, the leaf will appear black (which corresponds to absence of color).
