The correct option is
C Actinomorphic and hypogynous
Hibiscus rosa-sinensis belongs to the family Malvaceae. It is characterised by the complete, actinomorphic and hypogynous flower. A flower is actinomorphic when it can be divided into two equal halves by a vertical section passing through any plane. A flower is hypogynous when the ovary is placed superior to other floral organs on the thalamus.
Hence, the correct answer is 'Actinomorphic and hypogynous'