Sumit's group begins brainstorming ideas. becky states an idea and sumit says, "i think that's the best idea i've heard yet." based on this example, what should sumit keep in mind while brainstorming

I believe the answer is: Generation of ideas and evaluation of ideas should be separate. 
Generation of ideas refers to the process of acquiring the new ideas/thought from individual.
Evaluation of idea refers to the process of finding out whether that idea could be applicable to the current problem and could be considered as the best option for the group.

You gotta post the test so we can answer it