The correct option is A Androecium
Didynamous condition is related to androecium. The stamens in a flower are collectively called as the androecium. The androecium in various species of plants form a great variety of patterns, some of them highly complex. It surrounds the gynoecium and in turn the perianth, if there is one, surrounds the androecium. In didynamous condition the stamens occur in two pairs, a long pair and a shorter pair.
Therefore, the correct answer is option A.