What should be given to animal to reduce bloat?

Answer: Option A

Hay should be given to animals to reduce bloat.
It usually occurs when cattle or sheep are first turned onto legume pastures. It seldom occurs on grasses, (or pastures with at least 50% grass), coarser pastures, or hay.
Hay must constitute at least one-third of the diet to effectively reduce risk of bloat. Feeding hay or strip grazing may be reliable when the pasture is only moderately dangerous, but these methods are less reliable when the pasture is in the prebloom stage and the bloat potential is high.