Although the courts and the FTC have been quite specific about defining many other practices,the definition of has always been relatively vague.

Question

Although the courts and the FTC have been quite specific about defining many other practices,the definition of     has always been relatively vague.

Quizplus · Accepted Answer

The sentence specifically mentions that "the definition of unfair advertising has always been relatively vague", implying that this is the correct answer. The other choices are not mentioned in the sentence as being relatively vague in their definitions.

Although the Courts and the FTC Have Been Quite Specific