Answer:
1). The fact that the passage begins with the transitional phrase "first of all."
Step-by-step explanation:
The author employs an organizational structure to coordinate the events in a sequential order that guides the readers to follow up ideas as intended by the author and promote a comprehensive understanding.
As per the question, option 1 i.e. 'the fact that the passage begins with the transitional phrase "first of all"' exemplifies the most appropriate clue which reflects that the essay follows an organizational structure in order of significance of ideas. The use of 'first of all' implies the key idea that the author wishes to highlight 'if someone says your dream is impossible, they’re wrong' which is later followed up by other ideas that either complement or validate this central idea. Thus, this kind of arrangement or organization assists the readers to understand the content coherently. Therefore, option 1 is the correct answer.