Answer:
The CPI is 178 .
Option (c) is correct .
Explanation:
Formula

As given in the question
In 1983, a pair of jeans cost $66.35.
If a pair of jeans costs $118.10 today .
Put all the values in the formula


CPI = 178 (Approx)
Therefore the CPI is 178 .
Option (c) is correct .