**Core Concept**
The ideal contraceptive for a newly married couple should be effective, reversible, and have minimal side effects. It should also be easy to use and not interfere with future fertility plans.

**Why the Correct Answer is Right**
The correct answer, **C. Combined Oral Contraceptive Pills (COCs)**, is the ideal contraceptive for a newly married couple. COCs work by inhibiting ovulation through the suppression of gonadotropin-releasing hormone (GnRH) secretion, which in turn reduces the release of luteinizing hormone (LH) and follicle-stimulating hormone (FSH). This results in a decrease in estrogen and progesterone levels, preventing follicular growth and ovulation. COCs also thicken cervical mucus, making it difficult for sperm to penetrate the cervix.

**Why Each Wrong Option is Incorrect**
**Option A:** Barrier methods like condoms are effective but may not be as reliable as COCs, especially if not used consistently and correctly.

**Option B:** Intrauterine devices (IUDs) are highly effective but may not be suitable for all women, especially those with certain medical conditions or those who are not yet comfortable with the idea of an IUD.

**Clinical Pearl / High-Yield Fact**
It's essential for couples to discuss their contraceptive options with their healthcare provider to determine the best choice for their individual needs and preferences.

**Correct Answer: C. Combined Oral Contraceptive Pills (COCs)**