A circle divided into 6 parts. 1 part is shaded.
Which best describes the fraction represented by the shaded portion of the circle?

Since 1 of the 6 equal parts is shaded, the shaded portion represents One-sixth.
Since 1 of the equal parts is shaded and 5 are not shaded, the shaded portion represents One-fifth.
Since 5 of the 6 equal parts are unshaded, the shaded portion represents Five-sixths.
Since 5 of the equal parts are unshaded, the shaded portion represents Five-fifths.