The leading cause of death between ages 25 and 44 is

A. heart disease.
B. malignant neoplasms (cancer).
C. unintentional injury.
D. chronic low-respiratory disease.

http://longevity.about.com/od/longevity101/tp/mortalitymid.htm

That same site has the answer to question 2 in a link.

what is question 2

the deaths from heart, cancer and stroke, but they add to 50% which is not on your list of answers.

To determine the leading cause of death between ages 25 and 44, we can look at vital statistics data. One way to access this information is through official sources such as the Centers for Disease Control and Prevention (CDC) or the World Health Organization (WHO). Let's go to the CDC's website to find the answer.

1. Open your web browser and go to the CDC's website (www.cdc.gov).
2. In the search bar on the top right corner, type "leading causes of death" and press Enter.
3. From the search results, click on the link that says "Leading Causes of Death" under the "FastStats" section. This will take you to the CDC's page on the leading causes of death.
4. Scroll down to find the age group you're interested in, which is "25-44 years."
5. In this age group, you will see a table with different causes of death and their corresponding numbers. Look for the cause of death with the highest number of deaths.

Based on the data from the CDC, we can see that the leading cause of death between ages 25 and 44 is unintentional injuries (Option C).