Correct Answer - Option 3 : 9
Logic: Number of letters - 1 = Number
In REASON, there are 6 letters.
So, REASON = 6 - 1 = 5
In BELIEVED, there are 8 letters.
So, BELIEVED = 8 - 1 = 7
Similarly;
In GOVERNMENT, there are 10 letters.
So, GOVERNMENT = 10 - 1 = 9
Hence, "9" is the correct answer.