In families living in dangerous neighborhoods, parents want to move because they feel that if their children have delinquent friends, they will also be likely to become delinquency. Sociological research this belief.

Sociological research "supports" this belief.

Explanation:

The social research support this belief because human mind is combination of observance and analysis. Where humans observe whatever is happening in environment and respond accordingly by default, which is majorly common in teenagers or small age group people.

Parents or guardians have huge concern regarding the environment or society in which their children grew.Thus it is very important for parents to exclude children from such environment, as in such period they rapidly get influenced without having second thought.

did mary wollstonecraft believe was a natural ingredient for women’s happiness?

so you should go with

a. strong