(1) 100 N
Let the reactionary force exerted by each of the two fixed wall AB and AC on two ends of the rod (perpendicular to the plane of the walls) be
The line of action of each of these two forces will be inclined with the vertical line passing through the CG of the rod at an angle
So the vertical component of each reactionary force will be
This total force of reaction will be just equal and opposite to the weight of the rod of mass 10kg.
Hence the option (1) is the answer.