The correct option is B Cycas
Largest ovule in plant kingdom is found in Cycas. Female cone consists of megasporophylls. Each megasporophyll bears 2-12 reddish ovules in the middlefertiIe part. Ovules of Cycas are the largest, 6-7 cm in diameter. The sperms of Cycas are also the largest (300 micrometers) in the biological world.