This document discusses the reliability of Source C and its claims about the ineffectiveness of ERP (Electronic Road Pricing). It provides guidance on how to evaluate whether Source C can be believed based on cross-referencing it with other sources. Specifically, it states that Source C can be believed if another source like Source B supports the same claim about ERP's ineffectiveness. However, if a source like Source D contradicts Source C's claim, then its claims may not be reliable. The document also notes that Source C's reliability depends on whether it has a hidden agenda or purpose in making its claims.