Part A: The intensive pronouns used in the paragraph are "myself" and "himself."
Part B: "I built a miniature log cabin using pretzels for my American History class, taught by Mr. Rogers. Mr. Rogers was impressed with my pretzel log cabin and said it should be put in the Smithsonian Museum. My parents and I were proud of my achievement."
Part C: One achievement I'm proud of is graduating from college. It wasn't easy - I had to juggle a part-time job, coursework, and extracurricular activities all by myself. However, I pushed through and earned my degree. I'm proud of myself for working hard and achieving my goal, and my family and friends are proud of me too.