The organization adbusters publishes its magazine with spoof
advertisements to:
o
a. make up for the lack of ads in other magazines.
o
b. provide entertainment for its consumers.
o
c. show consumers more effective ads.
o
d. encourage consumers to think critically.

The organization Adbusters publishes its magazine with spoof  advertisements to: encourage consumers to think critically.

D. encourage consumers to think critically.

Explanation:

The Adbusters Media Foundation which is Founded‎ in ‎1989  by ‎Kalle Lasn‎ and Bill Schmalz in ‎Vancouver‎, British Columbia, Canada . It is a magazine which publishes advertisements to encourage consumers to think critically.

Adbusters depicts itself as "a worldwide system of specialists, activists, authors, pranksters, understudies, instructors and business visionaries who need to propel the new social extremist development of the data age.

Since satirizing an advertisement, it takes the components of the promotion that give its capacity and make them ludicrous. So purchasers turn the message around to show that it is silly or even false.