Answer:
The correct answer to this open question is the following.
Although there are no options attached we can comment on the following.
Indeed, Okinawa and Amami Great Island are the biggest among the Ryukyu Islands. These bigger islands were created due to natural phenomena, specifically due to the constant volcanic activity in this region of the planet.
The sea bed of the region suffers from constant volcanic activity in the region of the Pacific and Euroasian tectonic plates. The powerful pressure from the mantle makes magma leave and helped in the creation of these large islands.
The Ryukyu Islands are a series or chain of islands in southwest Japan. In fact, Okinawa is the largest island of the chain.Step-by-step explanation: