A beam of light in the xy-plane enters an inhomogeneous transparent medium at the origin \((0,0)\) traveling into the first quadrant at an angle of \(45^\circ\) above the horizontal \(+x\)-axis. The index of refraction \(n(y)\) of the medium depends only on the vertical coordinate \(y\) and decreases continuously as \(y\) increases. Which of the following graphs best represents the path \(y\) as a function of \(x\) of the light beam as it propagates through the medium?