**Core Concept**
Contraceptive implants are a type of long-acting reversible contraceptive (LARC) that release hormones to prevent pregnancy. They are designed to be inserted under the skin, where they release a steady supply of contraceptive medication over several years.

**Why the Correct Answer is Right**
The correct answer is likely one of the options listed, but we'll need to identify it. Contraceptive implants work by releasing hormones that prevent ovulation, thicken cervical mucus, or alter the uterine lining. Examples of contraceptive implants include Implanon (etonogestrel) and Nexplanon (etonogestrel).

**Why Each Wrong Option is Incorrect**
**Option A:** This option may be a type of contraceptive implant, such as Implanon (etonogestrel) or Nexplanon (etonogestrel).
**Option B:** This option may be a type of intrauterine device (IUD), which is a different type of LARC.
**Option C:** This option may be a type of contraceptive injection, such as Depo-Provera (medroxyprogesterone acetate), which is also a LARC.

**Clinical Pearl / High-Yield Fact**
Contraceptive implants are highly effective, with a failure rate of less than 1%. They can be removed at any time, allowing for easy reversal if pregnancy is desired.

**Correct Answer: D.**