Final answer:
Option B, which indicates that the text 'highlights the joy and activity of a lively summer,' best summarizes 'A Busy, Happy Summer' based on the joyful and vivid descriptions provided in the excerpts.
Step-by-step explanation:
The best summary of the text "A Busy, Happy Summer" appears to align most closely with option B, given the information provided and the descriptive diction highlighted in the various excerpts. Option B states that the text highlights the joy and activity of a lively summer, which correlates with the given example depicting a scene with joyful tone, use of vivid and positive sensory details such as "The sun gleamed brightly on the parade, and colorful streamers floated through the air like dazzling rainbows." This choice encapsulates the essence of the busy, happy summer that is discussed throughout the different evaluations of the text. Conversely, options A, C, and D, which mention challenges, slowness, and difficulties, do not reflect the joyful and lively tones captured by the words chosen to describe the summer in the example provided.