In twentieth century music what began to happen to the difference between consonant and dissonant chords? >
a. they began to create tensions that resolved
b. they began to disappear
c. they began to provide stability
d. they began to provide resolution

The main difference that we could point out between the consonant chords and the dissonant chords is that the former mainly utilises that notes between the middle C and G in which its respective sharps are used while the dissonant chord still uses the same notes, but it now is "jarring" in sound nature.

Sorry sir you did not give us the graph i typically but i'm very confused my conclusion is you're missing valuable information in the question