The line "And my life's cold winter that knew no spring" primarily emphasizes the struggles the speaker has experienced in life. The imagery of "cold winter" suggests harshness, isolation, and difficulty, while the absence of "spring" implies a lack of renewal, hope, and positive change. This creates a sense of despair and emphasizes the idea that the speaker has endured a prolonged period of hardship without the relief or rejuvenation that spring represents. Therefore, the most fitting response is:
It emphasizes the struggles the speaker has experienced in life.