**Core Concept**
The question requires identification of direct causes of maternal mortality, which refers to the deaths of women during pregnancy, childbirth, or within 42 days of termination of pregnancy due to complications arising from or exacerbated by pregnancy or its management. Direct causes are those that are directly related to the pregnancy itself.

**Why the Correct Answer is Right**
Direct causes of maternal mortality include hemorrhage, hypertensive disorders, obstructed labor, and severe infections. These conditions can lead to immediate life-threatening complications if not promptly managed.

**Why Each Wrong Option is Incorrect**
* **Option A:** Indirect causes of maternal mortality are those not directly related to the pregnancy, but rather to pre-existing conditions or external factors. Examples include cardiac disease, cancer, and accidents. Indirect causes are not directly related to the pregnancy itself.
* **Option B:** This option is not provided, so we cannot determine its correctness.
* **Option C:** This option is not provided, so we cannot determine its correctness.
* **Option D:** This option is not provided, so we cannot determine its correctness.

**Clinical Pearl / High-Yield Fact**
It's essential to differentiate between direct and indirect causes of maternal mortality to ensure timely and effective management of complications arising from pregnancy.

**Correct Answer: A. Indirect causes of maternal mortality.