Credits, and course length

<p>Each of my classes takes half a school year: about 18 weeks, and it's called a semester. However, I get one entire credit for each class.
Now, on the NC state application form, it asks for the "Course Length". The options are:
.25 (Quarter)
.33 (Trimester
.5 (Semester)
1.0 (Year/Block)</p>

<p>Now, again, my classes are each semester, at least I think. We don't take each class the entire year. But we do get one credit.
So which one do I pick? I've been getting the feeling the answer is staring me in the face, but I'd like at least one person on the internet to support me before I make a decision.</p>