Marta no longer uses a particular vending machine on campus because it has consistently failed to deliver Marta's snack or soda when she inserted her money and made her selection. Marta's experience BEST illustrates:

A. intermittent .
B. reinforcement.
C. habituation.
D. adaptation.
E. extinction

E. extinction    

Explanation:

Extinction: In psychology, the term "extinction" is described as a process in which a specific conditioned response becomes weak gradually that leads to the disappearance or decrease in the behavior associated with it. As a result, that particular conditioned behavior stops eventually and hence the response gets extinct. The concept of extinction is one of the parts of the conditioning process.

In the question above, Marta's experience best illustrates extinction.

answer; /// i believe that the correct answer is(

"harry t. moore (1905-1951) – civil rights activist, leader, and the first martyr of the civil rights movement. fannie lou hamer (1917–1977) – leader in the american civil rights movement; co-founder of the national women's political caucus and freedom democratic party. james farmer (1920–1999) – congress of racial equality."