Which of the following is a free polyembryonic species of citrus?

Correct option is D

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 C. reticulata, C. paradisi and C. jambhiri are polyembryonic citrus species, producing multiple nucellar embryos per seed. Hence, all are correct.

Citrus reticulata (Mandarin) Polyembryonic -Often possesses nucellar embryos along with zygotic ones

Citrus paradisi (Grapefruit) - Strongly Polyembryonic = Seeds produce multiple nucellar embryos

Citrus jambhiri (Rough lemon)- Highly Polyembryonic= Rootstock species, strongly nucell