Irrational number has unsolvable root overs.
Last two are now our options

Hence its not irrotational.
Hence
Option C is irrational.
Answer:
I believe it's D but I'm not 100 percent sure. I hope this helped I'm sorry I couldn't help more <3
I think it’s six because 3n=6-5 3 n=6-5 then subtract 5 5 from 6 6