We have two identical metal sheets. One of them is rubbed with sandpaper, and the other with ordinary paper. The one rubbed with sandpaper shines more than the other. Give a reason.
a) Sandpaper removes impurities and smoothens the surface, enhancing reflectivity
b) Ordinary paper leaves a residue dulling the surface
c) Chemical reaction between metal and sandpaper enhances shine
d) Sandpaper creates microscopic grooves, increasing light reflection
