Discussion
Female gametophyte in Gnetum at later stage is :
Answer: D
At a later stage, the female gametophyte of Gnetum is multinucleate.
In Gnetum the functional megaspore undergoes repeated free-nuclear divisions, giving a large female gametophyte with many free nuclei and no archegonia. At the time of fertilisation the micropylar part is still free-nuclear and its nuclei act as eggs; the chalazal part becomes cellular, but the gametophyte as a whole remains a multinucleate structure.
It never stays uninucleate or binucleate. The eight-nucleate gametophyte is the Polygonum-type embryo sac of flowering plants, not that of Gnetum.
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