Final answer:
The diaphragm is a flexible plastic cup used as a contraceptive method. Abstinence is the most effective way to prevent pregnancy.
Step-by-step explanation:
The first statement describes the diaphragm, which is a flexible plastic cup that is inserted before sexual activity to provide a physical barrier against sperm.
The second statement describes abstinence, which is the most effective method of contraception as it involves not engaging in sexual activity altogether, ensuring that pregnancy will not occur.
The third statement is missing information, making it difficult to match it with a specific type of contraceptive.
Learn more about Contraceptives