Which structure eliminated the need for water for plant reproduction?

Question

a. pollen
b. pollinators
c. flowers
d. sperm
e. cones

with flowers, wind and bugs could do it.

Bob- In my lecture it says..."some plants developed pollen instead of sperm as male gametes so that they could be carried by wind rather than water to the female gametes..."

With that it kind of sounds like pollen right? I'm not good at this! Thanks.