The correct option is D 0
Given terms are: 105,85,60,30,0,−45,−90
Here, the difference between the consecutive terns of the series is −20,−25,−30,−35,−40,−45.
Clearly, 30−35=−5.
Therefore, the number 0 is to be replaced by −5.
Hence, option (D) is the correct answer.