If in a coding system, SHELVES is coded as 100 and TURNING is coded as 87, then
how will REDRESS be coded in the same coding system?

Given, 

SHELVES is coded as 100 and TURNING is coded as 87.

The pattern followed here is : 

• Addition of the place value of reverse alphabet of the given alphabet in a word and 1. 
• Reverse alphabet = 27- Place value of alphabet. 

SHELVES = 8 + 19 + 22 + 15 + 5 + 22 + 8 = 102 + 1 = 103 

TURNING = 7 + 6 + 9 + 13 + 18 + 13 + 20 = 86 + 1 = 87

Similarly, 

REDRESS = 9 + 22 + 23 + 9 + 22 + 8 + 8 = 101 + 1 = 102 

Hence, Option C is correct.