Which of the Following Features of a Systems-Thinking Approach Is

Which of the following features of a systems-thinking approach is best illustrated by this statement?
Early pregnancy has been found to be an effective time to provide intensive smoking cessation services.

A) Systems-thinking focuses on the interconnections and interactions between health problems.
B) Systems-thinking looks for leverage points where interventions 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.