The correct option is D coconut
In coconut, the pollination is carried out through the agency of wind (anemophily).
In Salvia, the pollination is carried out through the agency of insects (entomophily).
In Vallisneria, the pollination is carried out through the agency of water (hydrophily).
In Callistemon (bottle brush), the pollination is carried out mainly through the agency of birds (ornithophily).