Answer:
Letter c is correct. It encourages participation from everyone.
Step-by-step explanation:
People are encouraged to participate in a nominal group technique because it is comprehensive to all participants.
This technique consists of creating group dynamics where each member can express their opinion about what is being proposed by voting, independently and silently, which consequently encourages the breakdown of shyness and reduces the pressure on the participant. This technique has positive effects by balancing the participation of all people and by motivating the group's sense of belonging and effectiveness.