Amanda (age 39) lives a very hectic life that allows for little sleep. she doesn't eat a healthy diet or exercise. she is worried because her mother developed heart disease at the age of 40. what are the uncontrollable risk factors in amanda's situation?

a. environment, stress, lack of sleep
b. diet, age, and lack of exercise
c. gender, diet, and the environment
d. heredity, age, and gender