**Core Concept**
The barrier method of contraception involves the use of physical barriers to prevent sperm from entering the uterus, thereby preventing fertilization. This method relies on the mechanical obstruction of sperm entry into the female reproductive tract.

**Why the Correct Answer is Right**
The correct answer involves the use of a physical barrier to prevent sperm from entering the uterus. This is achieved through the use of condoms, diaphragms, or cervical caps, which physically block sperm from reaching the egg. The effectiveness of the barrier method depends on proper use and fitting of the device.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is not a type of barrier method. Instead, it refers to a different contraceptive method that involves the use of hormones to prevent ovulation.

**Option B:** This option is incorrect because it is not a type of barrier method. Instead, it refers to a surgical method of sterilization.

**Option C:** This option is incorrect because it is not a type of barrier method. Instead, it refers to a natural family planning method that involves tracking ovulation to prevent pregnancy.

**Clinical Pearl / High-Yield Fact**
It's essential to note that the barrier method is most effective when used consistently and correctly. Failure to use the device correctly or consistently can lead to unintended pregnancy.

**Correct Answer: D.**