Both blocking and overshadowing demonstrate that A) contiguity ...

[shenderson6]

Both blocking and overshadowing demonstrate that
 
  A) contiguity is the critical factor in conditioning.
  B) mere contingency between a neutral stimulus and a US is insufficient for conditioning to occur.
  C) mere contiguity between a neutral stimulus and a US is insufficient for conditioning to occur.
  D) Both a and b are correct.

Question 2

In blocking, a compound stimulus consisting of _____ is paired with a US.
 
  A) an NS and a CS
  B) two NSs
  C) two CSs
  D) a higher-order CS and a lower-order CS

[Briannahope]

Answer to Question 1

C

Answer to Question 2

A