Answer
A, B, C
Work Step by Step
Because this is diffraction by a double split experiment, the intensity is proportional to the parameter, $\beta$, as shown in the equation below.
$$I(\theta)=I_m(\cos^2\beta)(\frac{\sin\alpha}{\alpha})^2$$
From the graphs, the curves with the largest $\beta$ values will have the largest intensity; therefore we will rank them A, B, C. (greatest first)
