Let the original price of jacket = j
Let the original price of shirt = s
Sale price of jacket = 100% j - 15% of j = 85% j
Sale price of shirt = 100% s - 10% of s = 90% s
Target question: How much greater was the original price of the jacket than the original price of the shirt?

Statement 1: The sale price of the jacket was $8 greater than the sale price of the shirt.
i.e what is j-s?
85% j - 90% s = $83
0.85j - 0.9s = 83
The value of j and s is unknown; so, statement 1 is NOT SUFFICIENT.

Statement 2: The original price of the jacket was $140
j=140 and j-s = 140 - s
The value of s is unknown, so, statement 2 is NOT SUFFICIENT.

Combining both statements:
From statement 1: 0.85j - 0.9s = 83
From statement 2: j = 140
0.85 (140) - 0.9s = 83
119 - 0.9s = 83
0.9s = 36
s = 40
So, j - s = 140 - 40 = 100
Therefore, both statements combined are SUFFICIENT.
Answer = option C