Distinct points A, B, C, and D lie on a line, with A B=B C=C D=1. Points E and F lie on a second line, parallel to the first, with E F=1. A triangle with positive area has three of the six points as its vertices. How many possible values are there for the area of the triangle?

**Answer Choices**

A. 3

B. 4

C. 5

D. 6

E. 7