Japan consists of large islands and over three thousand smaller
ones.
OA) four
OB) three
OC) five
OD) nine

OC) five

Explanation:

The five main islands, from north to south, are Hokkaido, Honshu, Shikoku, Kyushu and Okinawa. Honshu is the largest and referred to as the Japanese mainland.

i'm sure the answer you are looking for would be

a. an ice age

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