Statement A: Not all copulations lead to fertilisation and pregnancy.

Statement B: Fertilisation can only occur if the ovum and sperms are transported simultaneously to the site of fertilisation.

The motile sperms swim rapidly, pass through the cervix, enter into the uterus and finally reach the ampullary region of the fallopian tube. The ovum released by the ovary is also transported to the ampullary region where fertilisation takes place. Fertilisation can only occur if the ovum and sperms are transported simultaneously to the ampullary region.