Diffraction Grating №1 Has Half the Lines/cm That Diffraction Grating

Multiple Choice

Diffraction grating №1 has half the lines/cm that diffraction grating №2 does.When used with a certain wavelength of light,both gratings give first-order maxima.Which of the following statements is true for the same wavelength of light.

A) Both gratings must also give second-order maxima.
B) Grating №1 must give a second-order maximum.
C) Grating №2 must give a second-order maximum.
D) It is possible that neither grating gives a second-order maximum.