**Core Concept**
Recurrent early pregnancy loss is a condition where a woman experiences multiple miscarriages, typically defined as three or more consecutive losses. The underlying causes can be **anatomical**, **hormonal**, **immunological**, or **genetic**.

**Why the Correct Answer is Right**
Although the correct answer is not provided, investigations for recurrent early pregnancy loss typically include **karyotyping** to check for genetic abnormalities, **hysterosalpingography** or **hysteroscopy** to evaluate the uterine cavity, and tests for **antiphospholipid syndrome** and **thyroid function** to assess hormonal and immunological factors.

**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific option, it's challenging to provide a detailed explanation, but any option that does not address the potential causes of recurrent pregnancy loss would be incorrect.
**Option B:** Similarly, without the specific details, any option that does not include a comprehensive approach to diagnosing the condition would be wrong.
**Option C:** An option that focuses solely on one aspect, like genetic testing without considering anatomical or immunological factors, would be incomplete.
**Option D:** An option that ignores critical tests for hormonal and immunological factors would not be appropriate.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that **antiphospholipid syndrome** is a significant cause of recurrent pregnancy loss, and testing for this condition is crucial in the diagnostic workup.

**Correct Answer:** Not provided in the query.