Support
An argument is a statement that portrays a divergent view from other statements.
To prove the validity or veracity of one's argument, analysis, or idea, it must be backed up by evidences, facts, details, and examples. These details strengthens the argument or analysis, and weakens other opposing views.
Therefore, when facts, details, and examples, are provided in an argument. analysis, or idea, the primary aim of providing these details is to provide support for the argument, analysis, or idea.
The best word that fits into the blank is "support"
