Please hurry and help me I will give out the brain thing and extra points
Which sentence is not a compound sentence?
A) The man was far away, and we could not see him clearly.
B) The little puppy barked, and Jason took him outside.
C) Kale, which is nutritious and low in fat, has become available in greater variety.
D) Bookstores are popular, and they have many interesting books, but there are too few science fiction books.