John refuses to alter his opinion because it seems so obvious it ...

[fahad]

John refuses to alter his opinion because it seems so obvious it must be correct. According to Peirce, John is basing his belief on the
 
  a. a priori method.
  b. method of authority.
  c. method of tenacity.
  d. scientific method.

Question 2

When an explanation is accepted as true because it is advocated by an expert, this belief is based on the
 
  a. method of tenacity.
  b. method of authority.
  c. a priori method.
  d. scientific method.

[shewald78]

Answer to Question 1

c

Answer to Question 2

b