3n+5-6
Just simplify it, so now you have 3n-1
Let's go through each answer.
A) 3n+11 is incorrect because it does NOT equal 3n-1
B) 8n-6 is also incorrect because it does NOT equal 3n-1
C) 3n-1 IS correct because it DOES equal 3n-1
D) 3n+1 is incorrect because it does NOT equal 3n-1
So, your answer is C) 3n-1
~Hope I helped!~