a. Oogamy
b. Isogamy
c. Anisogamy
d. Zoogamy
A)Correct option – C
B) Explanation of correct option –
●It is a form of Sexual reproduction that involves the union or fusion of two gametes that is different in size form.
●The smaller gamete is male, called a sperm cell, and the larger gamete is female, called an egg cell.