Explanation:
B
Involucre: Involucres is used for only cluster of flower protecting the reproductive structures. Petaloid flower: Petaloid means when sepals resemble petals. Ex- Lily, Anemone, Hellebore flowers etc.
Poly sepalous: A condition in flowers that possesses a calyx, consisting of separate sepals.
Spathe: A large bract or pair of bracts forming a sheath to enclose the flower cluster of such plants as palms, arums, crocuses and day flowers (commelina).