If '+' an '-' are interchanged and also the numbers 8 and 6 change places, which of the
following options is correct?

Correct option is C

Interchanging the signs and numbers and using BODMAS rule,
Option 1.
6-8-8 +8=0
After changing '+' and ‘-‘ and 8 and 6
L. H. S. 8+ 6+6-6
20-6 =14 ≠0
Option 2.
12+8-6=2
After changing '+' and '-' and 8 and 6
L. H. S. 12-6+8
20 -6= 14≠ 2
Option 3.
12+ 6-8 = 10
After changing '+' and '-' and 8 and 6
L. H. S. =12-8+6
10=10
Option 4.
6-4+8-8=6
After changing '+' and '-' and 8 and 6
L. H. S. = 8+ 4-6 +6
18-6=12 ≠ 6
Hence, option c is the correct answer