Which word means to justify or deserve something?

The word "warrant" refers to justifying or providing a reason for something. In the context of the question, to "warrant" an action means to provide sufficient grounds or justification for it, thereby making it deserved. This word encapsulates the idea of supporting a claim or action with reasoning that makes it reasonable or legitimate.

Other options, while related, do not focus on the aspect of justification in the same way. "Deserve" speaks to merit, indicating that someone should receive something based on their actions or qualities but does not inherently involve the justification process. "Validate" suggests confirming the truth or legitimacy of something, while "earn" implies receiving based on effort or merit, but again does not directly carry the connotation of providing justification. Thus, "warrant" is the most precise term that aligns with the concept of justifying or deserving something.