Which of these is a method of barrier contraception?

Barrier contraception works by physically blocking sperm from reaching an egg, thereby preventing fertilization. Condoms are a prominent example of this method; they are designed to cover the penis during sexual intercourse, creating a barrier that prevents sperm from entering the reproductive tract. This method is effective not only in preventing pregnancy but also in reducing the risk of sexually transmitted infections (STIs).

The birth control pill, intrauterine device (IUD), and patch are methods of contraception that do not operate through a physical barrier. The birth control pill and patch release hormones to regulate the menstrual cycle and prevent ovulation, while the IUD is a device inserted into the uterus to prevent fertilization and may also inhibit implantation. None of these methods physically block sperm from entering the reproductive system, making the condom the only true barrier method among the options provided.