Read the following context and choose the best option to answer the question.
Context: I had a ball watching this movie . I was humming in my head to all the beats and song . I had no idea I know about ABBA songs so much ! If you 're a musical fan , then this movie is for you .
Question: Why did the writer have a ball watching this movie ?
Options: 
- Because they know about Abba .
 - None of the above choices .
 - Because they really enjoyed it .
 - Because they had no idea they know about Abba songs .


Because they really enjoyed it .