Final answer:
Based on the given description, the fold pictured is identified as a syncline because it exhibits a concave shape with the youngest rocks in the center.
Step-by-step explanation:
To identify the fold pictured, let's refer to the defining characteristics of a syncline. A syncline is a fold which exhibits a concave shape where the youngest rocks are in the middle of the fold and the oldest rocks are on the outside.
This is in contrast to an anticline where the folds show the opposite age pattern, and the rocks get older towards the inside of the fold. Recumbent folds have a horizontal axial plane, which differs from synclines and anticlines that typically have an inclined axial plane.
From the description provided, the fold in the image sounds like a syncline, since the rocks get younger towards the inside of it. Thus, among the choices provided, the correct answer is e. syncline.