Bertie's perspective, as revealed by details in the passage, suggests that he perceives the situation with a degree of bemusement and concern for Uncle Willoughby's well-being and the integrity of his manuscript. However, the provided options do not directly address his feelings or thoughts in the excerpt.
The most accurate inference based on the text is that he does not appear to share Florence's urgency or enthusiasm concerning Uncle Willoughby’s manuscript and seems inclined to protect his uncle's work. Thus, the option that might align more closely with Bertie’s viewpoint is:
He loses interest in marrying Florence once he hears her plans for Uncle Willoughby’s manuscript.
This choice reflects his shifting priorities as the anecdote develops, showcasing his potential reluctance towards Florence's assertiveness and her intentions regarding Uncle Willoughby's manuscript. However, the text provided does not specifically state this, leaving some room for interpretation.