Causal factors that occur early in life are considered ________ ...

[Pineappleeh]

Causal factors that occur early in life are considered ________ causes.
 
  A) sufficient B) contributory C) distal D) proximal

Question 2

While not all people who develop lung cancer are smokers, the likelihood of developing lung cancer is
  increased in those who smoke. In other words, with respect to cancer, smoking can be described as a
 
  A) contributory cause. B) etiological anomaly.
  C) sufficient cause. D) necessary cause.

[Hdosisshsbshs]

Answer to Question 1

C

Answer to Question 2

A