Correct Answer: Gladstone
Explanation: The quote "Justice delayed is justice denied" is often attributed to William Ewart Gladstone, a British statesman, who emphasized the importance of timely justice.

Incorrect Option 1: Plato
Explanation: Plato is a famous philosopher, but this quote is not associated with him.

Incorrect Option 2: Socrates
Explanation: Socrates also has many famous quotes, but this particular one does not belong to him.

Incorrect Option 3: Aristotle
Explanation: Aristotle's contributions to philosophy are immense, but this quote is not part of his work.

Incorrect Option 4: Rousseau
Explanation: Rousseau was a political philosopher, but this quote is attributed to Gladstone.