Gametogenesis is the process of formation of male and female gametes (b-i).
Pistils are female reproductive organs and have one or more carpels. The presence of fused carpels refers to the syncarpous stage (a-iii).
Formation of cytoplasmic bridge facilitates transfer to - strain nucleus into ascogonium and formation of dikaryotic hypha in higher ascomycetes (c-iv).
The presence of unisexual female flower is called as pistillate; these flowers lack stamen (d-ii).
Therefore, the correct answer is option B.