Correct option is C
Given Series:
86, 42, 22, 10, ?
Logic: Dividing by 2 and then subtracting 1.
86 to 42: 86÷2=43 (subtract 1) → 43−1=42
42 to 22: 42÷2=21 (add 1) → 21+1=22
22 to 10: 22÷2=11 (subtract 1) → 11−1=10
Continuing the Pattern:
10÷2=5 (add 1) → 5+1=6
So, the answer is (c) 6.