The Primary Difference Between Formal and Informal Fallacies Is That

The primary difference between formal and informal fallacies is that

A) formal fallacies involve invalid inferences while informal fallacies involve rhetoric.
B) formal fallacies involve explicit use of an invalid argument form while informal fallacies involve problems with the argument's content.
C) formal fallacies are identifiable while informal fallacies are not.
D) arguments committing formal fallacies can be repaired while those committing informal fallacies are beyond repair.