A student performs an experiment to determine the unknown index of refraction \(n\) of a flat acrylic block surrounded by air (\(n_{\text{air}} = 1.0\)). The student directs a monochromatic laser beam toward the block and measures the angle of incidence \(\theta_1\) in air and the corresponding angle of refraction \(\theta_2\) in the acrylic over several trials from \(10^\circ\) to \(75^\circ\), with both angles measured relative to the surface normal. Which of the following graphs will produce a linear best-fit line whose slope is directly equal to \(n\)?