Answer:
No adjustment is to be made on December 31, 2017.
Explanation:
The Insurance expense was prepaid on January 1, 2014 for four years, which means this four year insurance should have ended on December 31, 2017.
The Insurance was fully expensed out on January 1, 2014 which is discovered on December 31, 2017 when the Insurance is utilised and in usual circumstances should have been completely expensed out till December 31, 2017. No adjustment is to be made on December 31, 2017.