To choose the most effective answer, we should consider the context given in your message about wind companies relying on forecasts. The example is looking for an outcome where the actual electricity generation exceeded the predicted amount due to stronger winds than forecasted.
Based on this, the best option is:
(Choice B) strong enough to generate about 150 thousand more MWh of electricity from wind turbines.
This option implies that the winds were stronger than predicted and resulted in a higher generation of electricity, which aligns with the example context presented. Other choices either imply weaker winds or suggest incorrect amounts that would not effectively complete the example.