**Core Concept**
Specific death rates are adjusted for demographic factors like age and sex, allowing for more accurate comparison of mortality across populations. These rates help identify vulnerable subgroups and are used to determine disease-specific risks, aiding in targeted preventive strategies.

**Why the Correct Answer is Right**
Specific death rates are calculated per 100,000 individuals, stratified by age and sex, making them more precise than crude death rates. This stratification enables identification of high-risk groups (e.g., elderly men) for preventive interventions. They also reflect disease-specific mortality, such as cardiovascular or cancer deaths, helping public health programs prioritize actions. Thus, all listed statements are valid applications of specific death rates.

**Why Each Wrong Option is Incorrect**
Option A: While specific death rates are indeed age- and sex-adjusted, this option alone is incomplete as it misses the broader preventive utility.
Option B: This is correct in essence, but it’s only a subset of the full scope of specific death rates—missing the disease-specific aspect.
Option C: Though disease-specific, this statement is incomplete without considering demographic context.

**Clinical Pearl / High-Yield Fact**
Always use specific death rates when comparing mortality across age groups or sexes—crude rates can mask significant differences due to demographic skew. For example, stroke mortality is higher in elderly men, which becomes evident only with age-sex stratification.

✓ Correct Answer: D. All of the above