please explain the correct option

In a laboratory experiment, a diffraction grating produces an interference pattern on a screen. If the number of slits in the grating is increased, with everything else (including the slit spacing) the same, then A. The fringes stay the same brightness and get closer together. B. The fringes stay the same brightness and get farther apart. C . The fringes stay in the same positions but get brighter and narrower. D. The fringes stay in the same positions but get dimmer and wider. E. The fringes get brighter, narrower, and closer together