The best option as to the motif in the second stanza and the shift in the speaker's tone is the following:
C. Reflective to hopeful.
- In the first stanza, the speaker seems to be just reminiscing about the past.
- The speaker mentions a time when, along with someone else, a strange, curtainless house was spotted.
- Then, in the second stanza, the speaker reveals that the house was more meaningful than what we could have guessed from the first stanza.
- The bright lights in the house became a "constellation," guiding them and lighting up their world.
- When we are lost in the dark and we spot a light, a star, a constellation, we become hopeful.
- We feel that we can find our way out of that darkness.
- With that in mind, we can say the speaker's tone shifts from reflective to hopeful.
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