The correct answer is: All of the above.
The weight of each liquid is the same because the two test tubes are filled with equal volumes of water and mercury, and the weight of a liquid is directly proportional to its volume.
The bottom area of each test tube is the same because the test tubes are identical, and the bottom area of each test tube is the same.
The pressure at the bottom of each test tube is the same because the pressure at a given depth in a fluid depends only on the height of the fluid column and the density of the fluid, and not on the shape or size of the container. Therefore, since the test tubes are identical and filled with the same fluids to the same height, the pressure at the bottom of each test tube is the same.