The three correct answers that help develop the theme of perception versus reality in the text "Dusk" by H. H. Munro (Saki) are:
- Gortsby finds the soap and concludes that the young man’s story was true.
- Gortsby believes that the absence of a bar of soap means that the young man’s story is untrue.
- Gortsby interprets the man’s actions as a performance intended to create sympathy.
These events highlight how Gortsby's perceptions lead him to draw conclusions about the young man's reality, reflecting the theme of perception versus reality.