The correct option is B Determining sex of foetus
The fluid that surrounds the foetus in mothers womb is called the amniotic fluid. Amniocentesis is done in pregnant women to determine the sex of the foetus. This technique is used to prenatal diagnosis of chromosomal and genetic defects by extracting the amniotic fluid from the amniotic sac. After examining the cells and chemicals the general abnormalities are revealed in the test and parents can decide about the termination of foetus if required.