Final answer:
Laupahoehoe on the Hilo-Hamakua Coast of Hawaii is shaped by volcanic activity due to the Hawaii hotspot. The options provided in the question do not accurately describe Laupahoehoe. The Hawaii hotspot underlies the island, fueling its volcanic activity.
Step-by-step explanation:
Laupahoehoe along the Hilo-Hamakua Coast does not represent the geologically oldest part of Maunaloa or a catastrophic landslide of Kohala. Additionally, it is not related to the last lava flows of Maunakea reaching the sea, nor the longest-lasting lava flow from Kīlauea that formed the world's longest cave. Instead, Laupahoehoe is an area on the Big Island of Hawaii that, like other parts of the island, has been shaped over time by the volcanic activity associated with the Hawaii hotspot.
This hotspot is currently under the island of Hawaii, fueling three active volcanoes, two on land including Kīlauea and one under the sea. The volcanic activity on the Big Island is a result of the Pacific Plate moving over the hotspot. However, the question provided does not correspond accurately to any of the provided options regarding Laupahoehoe.