About a week has passed, and I am now finishing this statement under the influence of the last of the old powders. This, then, is the last time, short of a miracle, that Henry Jekyll can think his own thoughts or see his own face (now how sadly altered!) in the glass. Which theme best connects to this excerpt?

A. Human beings learn from nature.

B. Silence is a powerful tool.

C. Evil can never truly hide itself.

D. Strength comes from trials.