Approximately what in the minimum rate of spreading of the island
of kaui?

Nicknamed as "The Garden Isle" and it spreads the tare of 2.3 cms per year.

Explanation:

Kauai island is geologically the oldest of the island groups of the Hawaiian system. With an area of 562.3 square miles. UIts fourth largest island. The island is volcanic has been formed the passage of pacific plates over the Hawaiian hotspot. The climate of this island is tropical, with generally humid and stable conditions throughout the year. Rainfall ranges from 50 to 100 inches. Air is the only mode of transport in this region and has several highways. The economy is mostly based on tourism, and sugar cane plantations. Lots of earthquakes and Tsunamis have occurred at this place before as it moves withe the pacific plate.

What exactly do you mean 

C.about 10% i think