The correct option is A Androecium
When four stamens in a flower are present, out of them two are long and two are short, then it is called didynamous condition. Didynamous condition is related to androecium. The stamens in a flower are known as the androecium. The androecium forms a great variety of patterns in various species of plants and some of them are highly complex.
Arrangement of flower on floral axis is called inflorescence.
The gynoecium or female parts of the flower, comprises one or more pistils, each of which consists of an ovary, with an upright extension, the style, on the top of which rests the stigma.