Given below are four jumbled sentences. Select the option that gives their correct order.
A. Although I had a fear of water, I thought it was an important skill I should learn.
B. However, what I didn't realize was that it would also make me a more confident person.
C. I also thought it would be a good exercise that would make me physically stronger.
D. One of the hardest things I've had to do was to learn how to swim.