One of the Challenges Researchers Face in Using Ecological Frameworks

One of the challenges researchers face in using ecological frameworks to is that certain characteristics are difficult to manipulate experimentally. All of the following are examples of characteristics that are difficult to manipulate EXCEPT:

A) Increasing the cost of cigarettes to reduce number of cigarettes smoked
B) Improving housing standards for new homes to reduce asthma attacks
C) Increasing parental knowledge and changing attitudes toward asthma to reduce household asthma attacks
D) Prohibiting smoking in public facilities to reduce second hand smoke exposure
E) Increasing access to safe green spaces to promote physical activity