Which sentence contains an interjection?

Question

That’s an excellent biography of Thurgood Marshall.

Sojourner Truth was a popular speaker on women’s right to vote.

Wow, Dr. King’s “I Have a Dream” speech is extremely powerful.

The civil rights movement was really, really important!

Answer 1

The sentence that contains an interjection is:

"Wow, Dr. King’s 'I Have a Dream' speech is extremely powerful."

The word "Wow" serves as the interjection.