**Core Concept**
The ideal contraceptive for lactating mothers is one that is safe, effective, and minimizes the risk of interfering with milk production or the infant's health. This requires a contraceptive method that does not affect the hormonal balance or the milk supply.

**Why the Correct Answer is Right**
The correct answer is a non-hormonal, barrier method of contraception. This is because hormonal contraceptives, such as combined oral contraceptives (COCs) and progestin-only pills (POPs), can affect milk production and the infant's growth. On the other hand, barrier methods, such as condoms and diaphragms, do not affect hormone levels and are therefore safe for lactating mothers.

**Why Each Wrong Option is Incorrect**
* **Option A:** Combined oral contraceptives (COCs) are not ideal for lactating mothers because they can decrease milk production and affect the infant's growth.
* **Option B:** Progestin-only pills (POPs) may not be the best option for lactating mothers because they can affect milk production and the infant's growth, although to a lesser extent than COCs.
* **Option D:** Intrauterine devices (IUDs) are not the best option for lactating mothers because they may increase the risk of uterine infection during the postpartum period.

**Clinical Pearl / High-Yield Fact**
Lactating mothers should avoid hormonal contraceptives for at least 4-6 weeks postpartum, as they can affect milk production and the infant's growth.

**Correct Answer: C. Condoms. Condoms are a safe and effective form of contraception for lactating mothers.**