Considering what you have learned about writing style and writing lapses, which sentence demonstrates the best overall construction?

a. After having modified my writing style, I now write with greater confidence.

b. Learning to modify my writing style, has increased my confidence.

c. Since I has learned how to modify me writing style—a skill I didn’t know could be developed—I have been able to write every report effectively.

d. Having learned how to modify may writing style, may reports has improved.