(1) One of the most famous children’s books of all time is Green Eggs and Ham. (2) However, what most people don’t know is that the book was only written because of a bet between the author, Dr. Seuss, and Bennett Cerf, the co-founder of Random House. (3) Cerf bet Dr. Seuss $50 that he couldn’t write a book using only 50 unique words—and Dr. Seuss took his challenge! (4) However, green eggs and ham goes on to become Dr. Seuss’s best selling book, he never received the $50 Cerf owed him.

Which of the following transition words would best substitute the underlined words? Highlight the correct option.

1. Therefore
2. Although
3. Instead of
4. Similarly