In a Double-Slit Experiment,when Both Interference and Diffraction Are Taken

Multiple Choice

In a double-slit experiment,when both interference and diffraction are taken into account,which is the lowest order maximum that is missing in the case where the slit separations is 0.020 mm and the slit widths are each 0.005 mm?

A) 1
B) 2
C) 3
D) 4
E) no order is missing