Discussion

Explanation:

A. A small area of ground that is slightly higher than the ground around it: Hummock
B. A waterbody separated from a large water body by a reef: Lagoon
C. A narrow water body that connects 2 large water bodies: Straits
D. Small island: Islet
E. Ring-shaped coral reef or island: Atoll
F. A land bridge that connects two larger land masses: Isthmus
G. A group of islands: Archipelago
H. Rocky islands: Skerry
I. River island: Ait
Since only option D has the right sequence,
The correct option is D.

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