Psychologist Wolfgang Köhler Placed a Piece of Fruit and a Long

Psychologist Wolfgang Köhler placed a piece of fruit and a long stick outside chimpanzee Sultan's cage. Inside the cage he placed a short stick. Prior to gaining insight into the solution of the problem Sultan used

A) the short stick to try reaching the long stick.
B) the fruit to try retrieving the long stick.
C) the long stick to try retrieving the fruit.
D) the short stick to try retrieving the long stick.