In humans,fertilization is possible only when,

• A
  Ovum and sperm are transported simultaneously to the ampullary region
• B
  Haploid ovum (ootid) enters into the fallopian tube and sperm enters into the uterus at the same time
• C
  Ovum and sperm enter into the uterus at the same time
• D
  The haploid ovum (ootid) is released from the ovary and insemination to the vaginal orifice occurs at the same time