Monochromatic light with wavelength $5.30 \times 10^{-7}\,\text{m}$ falls normally on a diffraction grating. The first-order maximum is seen at an angle of $15.4^{\circ}$ to the direction of the incident light. What is the angle between the first-order and second-order diffraction maxima?
- A$7.7^{\circ}$
- B$15.4^{\circ}$
- C$16.7^{\circ}$
- D$32.1^{\circ}$