The correct option is C Diadelphous condition
The members of Liliaceae have perianth which is made of tepals. Perianth is a floral whorl found in monocot flowers where the calyx and the corolla cannot be distinguished from one another and look similar.
The stamens are attached to tepals, this is called epiphyllous condition.
Umbel inflorescence is seen in onions which belong to the family Liliaceae.
In umbel inflorescence, several pedicellate flowers of equal length arise from a common point.
Diadelphous condition is seen in the family Fabaceae. There are ten stamens in the flower and the filaments of 9 stamens unite to form one bundle and the 10th stamen is free.