The correct option is B diadelphous condition
Diadelphous condition is a characteristic feature of the family Fabaceae. In this condition, there are 10 stamens in the flower and the filaments of 9 stamens are united forming one bundle which is written as (9). One stamen is free.
Monadelphous condition is seen in Hibiscus, where all the filaments of stamens unite forming one bundle.
Polyadelphous condition is seen in Bombax, where the filaments of stamens unite to form more than two bundles.
Polyandrous condition is seen in rose plant, where the stamens are many and free (not fused).