Answer:
The correct option is:
D. It explains the idea that time and seasons never wait for anyone, through the voice of the bluebird in the poem.
Step-by-step explanation:
In this option, the perspective of the bluebird in the poem provides insight into the concept that time and seasons move forward continuously, emphasizing the fleeting nature of time and the changing of seasons. This perspective helps the reader better understand this particular theme within the poem.