"I Can't Believe That Amala Went Behind My Back and Bought

Multiple Choice

"I can't believe that Amala went behind my back and bought the necklace I told her I wanted to buy myself. Either she is terribly selfish or she is going to give it to me for my birthday. Without knowing her motives, I won't know the truth." Which sociological method (translated from the original German) is reflected in this statement?

A) interaction
B) motivation
C) self-interest
D) understanding