The combination of high levels of radon exposure and cigarette smoking has been found to multiply the incidence of lung cancer. Which of the following features of a systems thinking approach is best illustrated by this statement?
A) Systems thinking focuses on the interconnections and interactions between health problems.
B) Systems thinking looks for leverage points where specific actions can have a substantial impact.
C) Systems thinking looks at how problems change over time.
D) Systems thinking examines the impact of two or more simultaneous interventions.