Final answer:
To find out which statement best supports that watching hummingbirds is fun, we reviewed four options. Option D directly relates to the enjoyment of watching hummingbirds, which equates to having fun, and is thereby the best supporting statement.
Step-by-step explanation:
The student's question asks which statement from the passage best supports the idea that watching hummingbirds visit the backyard is fun. Option A mentions the 'colorful plumage' of hummingbirds brightening up the day, which is a positive aspect but does not directly imply fun. Option B talks about the backyard becoming 'a lively scene with their rapid movements,' which hints at excitement but not specifically at enjoyment.
Option C indicates that hummingbirds are 'a source of joy for birdwatching enthusiasts,' which aligns closely with the concept of fun but is not clearly the best option. Option D, 'The tiny creatures make our outdoor moments enjoyable,' directly supports the idea that observing the hummingbirds is fun and enjoyable. Based on the emphasis on enjoyment, which is synonymous with fun, the correct option in the final answer is D.