Seven-month-old Juan and his mother live in a small rented apartment in a large city. Affordable, high quality child care centers are very hard to find in her neighborhood. Which level of the environment, according to Bronfenbrenner's model, is limiting her access to high quality day care in her community?
a. Macrosystem
b. Exosystem
c. Microsystem
d. Mesosystem

Exosystem

Explanation:

Bronfenbrenner's model is the architecture of society developed in which there are fundamental four layers based on how a child learns to behaves and develops in those social structures.

microsystem:  society in which child is in direct contact with people around him such as students, teacher and parents.

mesosystem: It is the communication between two different social objects like interaction between parents and teacher in school. It is basically interface between various objects of microsystem

ecosystem: It is the structures of the society which develops the links between social object. It does not directly affect the child development. Example: legal system, media, education system

macrosystem: It is the social and cultural values developed by interacting with various component of society. Example: ethnicity, race, religion, poverty etc.

Since Juan is not able to find much needed child care facility, it is third layer i.e. Ecosystem. As child care is the component missing from societal structure and hindering the growth of Juan  

1. seasonal

2. frictional unenployment

3. the number of the labor force multiplied by 100 and then subtract the number of unemployed.

4. 4%

5. an increase in prices

i would say b. research typically uses a variety of sources