Dalessha developed a pure model of the street walker prostitute to help her study a large city ...

Dalessha developed a pure model of the street walker prostitute to help her study a large city ghetto. She is
  using a(n)
 
  A) typology. B) classification. C) parsimony. D) ideal type.

---

What type of sampling did Professor Howlick use?
 
  A) simple random sample B) cluster sample
  C) stratified random sample D) sequential sample

---

Dr. Sandra Gulley conducts research on day care centers. Dr. Gulley knows that her presence will influence
  employee behavior.
 
  For this reason, she explained social research to the day care center employees, told
  them about her own background, and settled employees' nerves by ignoring minor rule infractions. This
  illustrates
  A) the problem of gatekeepers. B) the use of argot.
  C) normalizing social research. D) being an acceptable incompetent.