Explanation:
B
Perianth: Perianth is a non productive \& vegetative part of a flower that protects and supports the reproductive parts. Sepal and petal do not take part in reproduction but just support reproduction, hence they are a part of perianth.
ex: Lily, Onian etc.
Perianth occur in family Poaceae, the perianth is reduced and represented by lodicules.