Final answer:
The Hawaiian Islands,(option d) with around 137 islands and atolls formed by volcanic activity, are an example of an archipelago.
Step-by-step explanation:
An archipelago is a group or chain of islands. The Hawaiian Islands (option d) are an example of an archipelago, comprising approximately 137 islands and atolls, stretching about 1,500 miles. Formed by volcanic activity from an undersea magma source known as a hotspot, the islands exemplify how stationary hotspots and moving tectonic plates can create a series of islands over time. The Hawaiian island chain is one of the most remote in the Pacific, offering a diverse range of environments from high mountain peaks to low-lying atolls.