**Core Concept**
Barrier methods of contraception, such as condoms and diaphragms, are used to prevent sperm from meeting the egg. These methods are ideal for individuals who have infrequent sexual activity or live apart, as they do not require daily or monthly administration and can be used on an as-needed basis.

**Why the Correct Answer is Right**
Barrier methods are the most suitable option for this couple because they can be used independently by each partner, without the need for regular medical check-ups or prescription refills. This is particularly important for individuals who live in different cities and meet only occasionally, as it allows them to maintain control over their reproductive health without relying on each other for contraception. Additionally, barrier methods are effective against both pregnancy and sexually transmitted infections (STIs).

**Why Each Wrong Option is Incorrect**
**Option B:** Oral Contraceptive Pills (OCPs) require daily administration and a consistent sexual activity schedule, making them less suitable for individuals with infrequent sex. OCPs also require a prescription and regular medical check-ups, which may be challenging for a couple living apart.
**Option C:** Intrauterine Contraceptive Devices (IUCDs) are effective for up to 10 years but require insertion and removal by a healthcare provider, making them impractical for individuals who live apart and meet only occasionally.
**Option D:** Depot Medroxyprogesterone Acetate (DMPA) injections are effective for 3 months but require regular administration and medical check-ups, which may be challenging for a couple living apart.

**Clinical Pearl / High-Yield Fact**
It's essential for couples to discuss their reproductive health needs and preferences with their healthcare provider to choose the most suitable contraceptive method for their lifestyle. Barrier methods, such as condoms, are not only effective but also provide protection against STIs, making them an excellent choice for individuals with infrequent sex or those living apart.

**✓ Correct Answer: A. Barrier methods**