Read the following sentences.
 Heather always gets sick when she eats cheese. She ordered a cheeseburger for lunch.
 Which of the following revisions is a correctly written complex sentence that shows a relationship between the two ideas?
 A
 Even though Heather always gets sick when she eats cheese, she ordered a cheeseburger for lunch.
 B
 Heather always gets sick when she eats cheese, she loves lunch.
 C
 Heather always gets sick when she eats cheese.
 D
 Heather ordered a cheeseburger for lunch, she enjoys the circus.