The answer is c. their gametes do not require water for fertilization to occur.
Fertilization is the process in which two gametes fuse which first creates a zygote and then leads to the development of an embryo. Pollination is a transfer of male pollen to the female reproductive organ. After pollen lands on the stigma, pollen tube begins to grow until it reaches an ovule which is inside the ovary. A nucleus of pollen will fuse with a nucleus of the ovule and that fertilization will occur.