The correct option is C pollination
The process of transfer of pollen grains from an anther to stigma is known as pollination.
In flowering plants, the non-motile male gametes present inside the pollen grains are carried to stigma by various agents. Pollen grains germinate on the stigma and form a pollen tube which carries male gametes to the ovule. The female gamete is present inside the ovule.
Fertilization is the process of fusion of male and female gametes to form a zygote. It is also called syngamy.
The process of gamete formation is called gametogenesis.