Correct Answer: Option 3

The above structure is referred to as syncline. In structural geology, a syncline is a downward-curving fold, with layers that dip toward the center of the structure. A synclinorium is a large syncline with superimposed smaller folds.

The drainage pattern formed by syncline is referred to as Trellis Drainage pattern. Trellis drainage patterns look similar to their namesake, the common garden trellis. Trellis drainage develops in folded topography like that found in the Appalachian Mountains of North America. Short tributary streams enter the main channel at sharp angles as they run down sides of parallel ridges called anticlines. Tributaries join the main stream at nearly right angles