The correct answer is 2. Cleanth Brooks because he was indeed the New Critic who served as the cultural attaché at the American Embassy in London from 1964 to 1966.
Here's some context for each option:
John Crowe Ransom – He was a prominent New Critic and founder of the journal The Kenyon Review, but he did not serve as a cultural attaché in London.
Cleanth Brooks – Cleanth Brooks was a leading figure in the New Criticism movement, known for his emphasis on close reading and text-centered analysis. Brooks was appointed as a cultural attaché at the American Embassy in London, where he served from 1964 to 1966. This is why he is the correct answer.
Allen Tate – Another influential New Critic and poet, but he was not associated with the cultural attaché position in London.
Robert Penn Warren – Known as a New Critic and as the author of All the King's Men, Warren was also not in the position of cultural attaché in London.
Cleanth Brooks' role in London added an international dimension to his career as he worked to foster cultural exchange during a pivotal time in British-American relations, making him a notable figure not only in literary circles but also in diplomacy.