Select the correct answer.
Eduardo is writing a research question to guide his study about motivating people to create community gardens. Which of Eduardo's research questions is most effective?

A.
How do communities with community gardens learn how to use available space to grow their own food?
B.
What initiatives have proven successful in motivating community members to create community gardens?
C.
Which government programs have been successfully implemented in communities where community gardens exist?
D.
What motivates the majority of people in a community to improve their health by focusing on better nutrition?