Final answer:
The best topic sentence for the paragraph is 'Its unique shape makes it appear graceful and poised.'
Step-by-step explanation:
The best topic sentence for the paragraph is: Its unique shape makes it appear graceful and poised.
This topic sentence effectively introduces the main idea of the paragraph, which is the unique shape of the calla lily and its graceful appearance. It sets the tone for the rest of the paragraph, which provides more details about the lily's shape and colors, and the author's personal preference for it. This topic sentence effectively captures the reader's attention and gives them a clear idea of what to expect in the paragraph.
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