A rectangular piece of paper whose length is \sqrt{3} times the width has area A. The paper is divided into three equal sections along the opposite lengths, and then a dotted line is drawn from the first divider to the second divider on the opposite side as shown. The paper is then folded flat along this dotted line to create a new shape with area B. What is the ratio B: A ?

**Answer Choices**

A. 1: 2

B. 3: 5

C. 2: 3

D. 3: 4

E. 4: 5