Discuss the concept of type a behavior pattern, its history, and what we now know concerning its role in heart disease.

explanation:

may i ask what challenges?

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."

answer; naturalistic observation;

the correct answer is the letter a

bright white has the greatest comparative advantage as it produces more than double the amount of small tubes than large in an hour.

sparkling comes next as it produces exactly double the amount which is to be expected

fresh comes in third because it only produces 50 more small tubes than large.

the company that shows the least comparative advantage is mmmint as it produces the same amount of small and large tubes.