The correct option is C Entomophily
The cross-pollination through humans is called anthropophily. THe cross pollination through snail is called as malacophily. The cross-pollination through birds is called as ornithophily. Whereas the cross-pollination through insect is called as entomophily. Such flower is called as entomophilus flower which possess special characters like open, colourfull and nectar producing flower and they possess sticky pollens. Thus, the correct answer is option C.