How do moon phases occur and their different lengths ?

These differing shapes of illumination are referred to as the ‘phases’ of the Moon, which occur in a perpetual cycle over a 29.5-day (synodic) period. There are eight main identifiable phases which follow each other sequentially as the Moon orbits the Earth according to the changing relative positions of the Earth, Moon and Sun.

Explanation:

so yeah

common management practices in dairy and poultry farming are: (i) proper shelter facilities and their regular cleaning. (ii) some basic hygienic conditions such as clean water, nutritious food, etc. (iii) animals are kept in spacious, airy, and ventilated place.

looks like the answer is     c     to me!