D.Learning how to swim helped me get over my fear of water and made me a more confident person.
Explanation:
A memoir are basically the stories of the life of someone, by telling them they can see their lifes, the events that broguth them where they are now, and they can come up with conclusions on how a certain event helped them grow or overcome things in life, in this case as he writes learning how to swim helped him to get over the fear of water and made him a more confident person, the other options wont come with a learning or an improvement on the character of the author.
