“do not go gentle into that good night” has a theme of a. respect for a tough, experienced survivor. b. the need to learn from past mistakes. c. the importance of life and the need to cling to it. d. the dangers of low self-esteem.

The third option, C, seems correct to me. This is because in Dylan Thomas' poem, it symbolizes night as death and light as life. Using poetic devices, he talks about his father who is on the verge of death (night) but should still defy his fate by clinging onto life (light) so that he doesn't go gentle into death. 

Let me know if you need anything else. :)

                          - Dotz

Your answer is a. i’m pretty positive.