Answer:
a. one
Step-by-step explanation:
Oogenesis is a type of gametogenesis by which female gamete is formed from the germ cells present in the ovary. During oogenesis, the primary oocyte is formed when oogonia are at the prophase-I of the meiotic division before the birth of a female foetus. Further division of primary oocyte is arrested. At puberty the primary oocyte, a diploid cell divides to form one haploid secondary oocyte and one polar body. Thus, at the end of meiosis I one secondary oocyte is formed.