Designing Quizzes CSS (Cascading Style Sheets)

Question:
Which of the below is the correct way to set a background image?

Option A):
body {background-image:url('paper.gif')}
Option B):
body {background-image:url('paper.gif')};
Option C):
body {background-image:url('paper.gif');}
Option D):
body {background-image:url(paper.gif);}

Correct Answer is Option C):
body {background-image:url('paper.gif');}