The total volume of water displaced by a set of one or more objects, floating on water is has a mass equal to the mass of all the objects in the set. It does not matter if the objects are placed one over the other, or if they float separately. In the situation explained in the question, the total weight of the two pieces of wood does not change when instead of being placed on top of each other they are placed separately in the bath tub. Therefore there will be no change in the volume of water displaced, and accordingly no change in the level of water in the bathtub.
Thus option C) is correct.
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