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

111, 90, 71, 54, ?

​111, 90, 71, 54, ?

Logic: The differences between consecutive terms are decreasing by 2

111−90=21

90−71=19

71−54=17

The next difference should be: 

17−2=15 

Subtract the next difference 54−15=39 

Thus, correct option is (b) 39