Think of each vertical line as the beginning or end of a line segment. Wherever there is a vertical line, break apart the line in your mind. How many parts do you get? 4!
So, the total number of parts is 4. It asks for the length of EACH part. Each part means one part.
Remember, a fraction is the number of parts over the number of parts total. If we are dealing with one part, and the total number of parts is 4, then the answer is 1/4.
Answer: C
