The correct option is
B Calyx, Corolla, Androecium and Gynoecium
There are commonly four distinct whorls of flower parts -
(1) An outer Calyx consisting of Sepals.
(2) The Corolla, consisting of Petals,
(3) The Androecium, are a group of Stamens.
(4) The Gynoecium, consisting of the Pistils.
A flower is not complete with these four parts
so, the correct answer is 'Calyx, Corolla, Androecium and Gynoecium'.