Medium Why can a hard material still fail under impact? AHardness always guarantees toughness BImpact resistance depends only on conductivity CHard materials contain no electrons DHardness is determined solely by electrical conductivity EHardness alone does not guarantee toughness Report a problem with this question What is wrong? The marked correct answer is wrongAn option is wrong or repeatedSpelling or wording mistakeSomething else Details (optional) Send report