Ans.
In females, the egg cells or oocytes produced by ovaries. The egg cell is then transferred to fallopian tubes, where they may fuse with sperm and fertilization takes place.
The fertilized egg is then transported to the uterus from fallopian tube. This is done by contractions in uterine muscles that push the fertilized egg towards the uterus, where it implants.
Thus, the correct answer is option). 'through muscle contractions.'