Which is a sound argument?
A.
I had a dream that I got a D on my biology test, and it came true. If I want to do better next time, I need to have a more positive dream.
B.
Beth wanted to become a better driver, so she took a driving class and studied the Motor Vehicles manual. Her driving really improved.
C.
After a strong wind storm last October, all of the leaves were off the trees. That is when I learned that wind is what makes the leaves fall.
D.
When Max realized he was getting a cold, he started taking Cold-Go-Awa+L8y pill. In four days, he felt much better, thanks to the Cold-Go-Away.