Is a problem in which group members strive to maintain cohesiveness and minimize conflict by refusing to critically examine ideas, analyze proposals, or test solutions.
a. groupthink.
b. grouphate.
c. brainstorming.
d. consensus

a. Groupthink

Explanation:

Groupthink is a problem in which group members strive to maintain cohesiveness and minimize conflict by refusing to critically examine ideas, analyse proposals, or test solutions.

It's a sort of  uncompromising consensus that can serve only in a former stage of a given plan, or equivalent I think. An example of this, is  taking place nowadays in the Venezuelan conflict, where official opposition (Asamblea Nacional; sort of Parliament) are inhibited of criticizing their internal mistakes or approaches to combat Chavismo tyranny, and fail discarding other voices in the opposition  that claim to ask for help from the international community, as Maduro and Chavismo represent a criminal state.

prosumerism is the correct answer.