Correct option (d) Plasmodium
Explanation:
Anopheles is the host of malarial parasite Plasmodium is known to occur most favourably in stagnant water, ditches, ponds, moist and damp places. Destruction of all the ponds and puddles, i.e. the breeding places of larva and pupae will cause destruction in the number of Anopheles and Plasmodium.