Answer:
This passage develops the theme "Evil can never truly hide itself” because:
C. Utterson and Enfield are horrified when they see Jekyll’s transformation.
Step-by-step explanation:
Utterson and Enfield see the smile on Jekyll's face disappear all of a sudden. In its place, an expression of despair and terror comes, so intense that the two men are instantly horrified. Jekyll is trying to hide the evil that is now awaken in him, but he is unable to do it well. Evil can never truly hide itself. No matter how hard Jekyll tries, something will always betray his intentions - a smile, a look, a word.