Which of the Following Is a Complex Sentence

Which of the following is a complex sentence?

A) Madrid has many museums and art galleries.
B) The city is well known for its nightlife, and its cafes are popular with tourists and locals alike.
C) Though bullfighting is censured by some, its popularity in Madrid continues unabated.
D) Madrid is a historical and cultural center in Spain.
E) The nightlife of Madrid is deservedly famous, but classical music still finds firm followers.