Due to lack of appreciation and criticism of most of their ideas, the introvert team members often shy away from participating whereas the extroverts start to dominate

Which technique should a team leader adopt to make sure that there is equal participation, and why?
a) Nominal-group technique; because people are more comfortable sharing their ideas when they have a written scrip
b) SWOTS analysis; because after the analysis they will be comfortable sharing their ideas
c) Pareto chart analysis; because a clear idea will give the introverts confidence to share
d) Tick-tock technique; because changing the negative comments into positive ones can bring the introverts out of their shells

A