Geographer David Clark Argues That Squatter Settlements Can Fill Some

Geographer David Clark argues that squatter settlements can fill some important and positive roles.Which of the following is NOT one of those positive roles?

A) They can emerge as vibrant communities with strong forms of social organizations.
B) They can provide an important transition for many rural to urban migrants, serving as the initial site for assimilation and acculturation.
C) They provide a source of cheap and accessible labor for urban industries.
D) They provide highly skilled technical labor for new information industries.