Which statement about the graphs is true? Graph A O Graph A is a valid density curve because the part of the graph from 2 to 6 is below the horizontal axis. 0.25 0.1875 Graph A is not a valid density curve because the part of the graph from 1 to 2 is above the horizontal axis. O Graph B is not a valid density curve because part of the horizontal axis has negative values. O Graph B is a valid density curve because the curve is 0.125 0.0625 -0.625 above the horizontal axis, and the area under the 0.125 curve is 1. 0.1875 5.