The three correct answers that help develop the theme of perception versus reality in “Dusk” are:
- Gortsby finds the soap and concludes that the young man’s story was true.
- Gortsby interprets the man’s actions as a performance intended to create sympathy.
- Gortsby believes that the absence of a bar of soap means that the young man’s story is untrue.
These events illustrate how Gortsby's perceptions lead him to different conclusions about the young man's reality, highlighting the theme of perception versus reality.