Hawaii Is the Most South-Eastern of the Seven Largest Islands

Hawaii is the most south-eastern of the seven largest islands and is also closest to the seafloor spreading centre from which the Pacific plate originates, which lies about 5,600 km further to the southeast. Assuming equal sedimentation rates, what should be the location of the thickest sediment layer and thus the area with the greatest diversity of fossils above the oceanic crust?

A) between the island of Hawaii and the seafloor spreading centre
B) around the base of the island of Hawaii
C) around the base of Kauai, the oldest of the large Hawaiian islands
D) where the islands are most concentrated (highest number of islands per unit surface area)