Final answer:
Option B, 'Historical context may change, but human nature stays the same,' is the sentence that most clearly describes a theme.
Step-by-step explanation:
The most clearly describing a theme sentence is option B: Historical context may change, but human nature stays the same. This sentence establishes a theme by suggesting that despite changes in time and place, human nature remains constant. It implies that humans have similar desires, motivations, and behaviors across different historical periods.
Learn more about Theme in literature