Concept:An inselberg is an isolated residual hill that rises abruptly above a broad erosional plain.
Explanation:Inselbergs form when agents of erosion wear down and lower the surrounding weaker rocks over a long period.
A hard, resistant rock mass is left behind, standing alone above the general level of the surrounding land.
They are most commonly found on a pediplain, which is a wide, gently sloping erosional surface produced by the backward wearing and merging of several pediments.
Pediplanation occurs mainly in semi-arid regions, where sheet flooding, weathering, and running water gradually flatten the landscape.
The tough residual hills that survive this process of lowering are known as inselbergs.
Therefore, the inselberg is the typical remnant feature of a pediplain rather than of a flood plain, peneplain, or outerwash plain.
Answer:A. pediplain