Which of the following sentences is a compound sentence?

Which is an independent clause in the following compound-complex sentence?

The doctor is out because of his daughter’s wedding, but he is back on Tuesday.

Which of the following is a simple sentence?

Which revision makes this simple sentence into a compound sentence?

Cell phones are popular.

Hurricanes are tropical cyclones that have wind speeds of up to 150 miles per hour.

Josephine found a reminder about her dentist appointment on the refrigerator.

The Irish wolfhound is the tallest breed of the species.

Many students who bring their lunches to school buy milk in the cafeteria.

Because I cannot find my favorite.

Abraham Lincoln, who moved from Illinois to Washington, grew up in Kentucky.

Thai dishes often include rice, but sometimes rice noodles are used instead.

Unless I get an A on my next math test, I won’t be able to go on the annual spring break trip with my friends; we are planning to go to Virginia Beach.

The fable says there will be six more weeks of winter if the groundhog casts its shadow.

I did not like that movie because it was too long, but my friends thought it was superb.