I think A is the best concluding sentence
Answer:
can you please but some more context into this so i may help you ?
Explanation:
The verb is rickety another name for rickety is shaky/weak.
The central idea of the passage is the author's passion for becoming a pilot and teaching others to fly.
The first paragraphs talk about the author's journey to becoming a pilot. Then it changes to him wanting to share his love of flying with others by becoming an instructor.