The correct answer is option 1 - Over cervix.
The diaphragm is a type of barrier contraceptive device that is inserted over the cervix, which is the opening of the uterus. It is a flexible, dome-shaped silicone cup that covers the cervix, preventing sperm from entering the uterus and fertilizing an egg.
Option 2 - In the fallopian tube is incorrect because the fallopian tubes are not involved in the use of the diaphragm as a means of contraception. The fallopian tubes are part of the female reproductive system responsible for carrying eggs from the ovaries to the uterus.
Option 3 - In the uterus is also incorrect because the diaphragm is not placed inside the uterus. It is placed over the cervix to block sperm from entering the uterus.
Therefore, option 1 is the correct answer.