Select the number from among the given options that can replace the question mark (?) in the following series.

1, 1, 3, 5, 11, 21, 43, ?

Given number series: 1, 1, 3, 5, 11, 21, 43, ?

Logic: Numbers are getting two times and 1 each substracting and adding alternately.

1 × 2 -1 = 1 

1 × 2 + 1 = 3

3 × 2 - 1 = 5

5 × 2 + 1 = 11

11 × 2 -1 = 21

21 × 2 + 1 = 43

So, the missing number is: 85

Thus, the correct option is: (c).