The correct options are
A Conifers
C Flowering plants
The term pollination refers to the transfer of pollen from an anther to a stigma. pollen grains are male gamete and ovules/eggs are the female gametes. Thus pollination takes place only in sexually reproducing plants. The plants like pine trees, ginkgo, cycads etc produce male and female cones. Such plants are called as gymnosperms (conifers). Plants like mango, apple, rose etc which produce flowers are called as angiosperms (flowering plants). Thus the pollination takes place in both types of plants i.e. gymnosperms and angiosperms as both are sexually reproducing plants.