The correct option is A Sexual reproduction
Fertilization is a process of fusion of gametes to produce new individual, which is generally the form of sexual reproduction.
Asexual reproduction is a mode of reproduction by which single parent produces new individuals without fertilization. And so in asexual reproduction, fertilization essentially is not required. Metamorphosis is the stepwise development of organisms from their larval stage to the adult stage as seen in frog.
Thus, the correct answer is option C.