In which of the families the stamens are in two whorls and epiphyllous?

Stamens of Malvaceae family are united at their filament level forming on  group and anthers remain free. For exampple, China rose (Hibiscus rosasinensis). 
Stamens of Solanaceae family are five in number and are present in single whorl. They are epipetalous (stamens are fused with petals). For example, Solanum tuberosum. 
Caesalpinioideae is a subfamily of family Fabaceae. They possess 10 stamens as 9+1 (9 in one bundle and remaining 1 as separate). They are free and are not united with any other part of the flower. 
Liliaceae stamens are six in number and are arranged in two whorls. They are present in epiphyllous condition (fused with perianth). For example, Lily and Garlic (Allium cepa). 
Therefore, the correct answer is option C.