What would cause the separation between adjacent interference minima on the screen to double? Why would this happen?

Coherent light (frequency f) passes through a double slit (separation d) to produce a pattern of maxima and minima on a screen a distance L from the slits. The whole setup is immersed in a liquid of refractive index n. Check the change(s) that would cause the separation between adjacent interference minima on the screen to double: O divide f by 2 O multiply L by 2 O divide d by 2 O divide n by 2 Enter