**Core Concept**
The comparison of death rates between two countries requires a method that takes into account the different population sizes and age structures of the two countries. Standardized mortality ratios (SMRs) or age-standardized death rates (ASDRs) are used to make such comparisons meaningful.

**Why the Correct Answer is Right**
Age-standardized death rates (ASDRs) are the most appropriate method for comparing death rates between two countries. This is because ASDRs adjust the death rates for each country to a common population structure, typically the world population or a standard population, allowing for a more accurate comparison between the two countries. This method helps to account for the differences in population demographics, such as age and sex, which can significantly affect the death rates.

**Why Each Wrong Option is Incorrect**
**Option A:** Crude death rates are not suitable for comparing death rates between countries, as they do not take into account the differences in population sizes and age structures. This can lead to misleading conclusions.
**Option B:** Life expectancy at birth is a useful indicator of a country's health status, but it is not a direct measure of death rates and does not account for differences in population demographics.
**Option C:** Cause-specific mortality rates are useful for identifying specific causes of death, but they do not provide a comprehensive picture of a country's overall mortality rates.

**Clinical Pearl / High-Yield Fact**
When comparing death rates between countries, it's essential to use age-standardized death rates to account for differences in population demographics. This helps to ensure that the comparison is fair and accurate.

**Correct Answer: C. Life expectancy at birth is a useful indicator of a country's health status, but it is not a direct measure of death rates and does not account for differences in population demographics.**