Respuesta :
Charles Darwin's would be the answer you're looking for.
Answer:
Based on this passage from John Stuart Mill’s “On Liberty,” Mill would most likely be a proponent of Charles Darwin's theories.
Explanation:
The passage is: There is always need of persons not only to discover new truths, and point out when what were once truths are true no longer, but also to commence new practices, … (“On Liberty”; chapter 3, p. 2)