Answer: The appeal made in this sentence is a logical appeal.
Explanation:
A logical appeal is a persuasive technique which is based on evidence. In this sentence, the statement made was based on a study published in the Wall Street Journal. The results of this study, therefore, represent evidence. According to Aristotle, apart from logical appeals, there are two other methods of persuasion - emotional appeals and ethical appeals.
The linking verb is the word, "is" and "effective" is the predicate adjective.
I hope this helps.
Take care,
Diana
