The principle illustrated when most people are able to recognize ...

[Chelseaamend]

The principle illustrated when most people are able to recognize a variety of examples of chairs even though no one category member may have all of the characteristic properties of chairs (e.g., most chairs have four legs but not all do) is
 
  a. family resemblance.
  b. prototypicality.
  c. graded membership.
  d. instance theory.

Question 2

The definitional approach to categorization
 
  a. is not well suited for geometrical objects but works for familiar everyday objects.
  b. sets definite criteria called family resemblances that all category members must have.
  c. doesn't work well for most natural objects like birds, trees, and plants.
  d. was proposed to replace the prototype approach.

[bdobbins]

Answer to Question 1

a

Answer to Question 2

c

[Chelseaamend]

Great answer, keep it coming

[anyusername12131]

Thanks for the timely response, appreciate it