**Core Concept**
Copper-T intrauterine device (IUD) is a type of long-acting reversible contraceptive (LARC) that releases copper ions to prevent pregnancy. The ideal candidate for Copper-T insertion is someone who is seeking a highly effective, non-hormonal, and long-term contraceptive method.

**Why the Correct Answer is Right**
The ideal candidate for Copper-T insertion should have a normal uterine cavity, be free of pelvic inflammatory disease (PID), and have no history of ectopic pregnancy or uterine anomalies. This is because the Copper-T IUD can cause local irritation and increase the risk of infection or ectopic pregnancy in these cases.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because there is no specific age limit for Copper-T insertion. While it's recommended for women between 18 and 45 years old, it can be used in women outside this age range if they meet other criteria.
* **Option B:** This option is incorrect because women with a history of PID can still use Copper-T, but they require careful evaluation and may need additional treatment before insertion.
* **Option C:** This option is incorrect because women with a history of ectopic pregnancy can still use Copper-T, but they require careful evaluation and may need additional testing before insertion.

**Clinical Pearl / High-Yield Fact**
Copper-T IUDs are highly effective in preventing pregnancy, with a failure rate of less than 1%. They are also a good option for women who cannot use hormonal contraceptives due to medical conditions or personal preferences.

**Correct Answer:** D