Dalton's Law: Why is My Answer Wrong?

[bwd111]

Can someone explain why this answer is wrong? I answered additive since the gases are added . Was told correct answer is not affected by changes in tempure. Qeustin was Daltons law states that when more than one is present in a container,ther pressures are and I answered additive. other choices where constant and identical

 

[mfb]

It is hard to figure out what your question is.
I guess your answer is right, and I am surprised that the other answer is none of the choices you posted.