Answer: Third option is correct.
Explanation:
Since we have given that
2n + 5 – 3p + 4n
First we gather the like terms:

So, we can see that
there are 3 terms i.e. one term with variable n, one term with variable p and a constant term with no variable.
i.e. 6n,-3p, and a constant term : 5
So, Third option is correct.