A parallel sentence mentions the same grammatical expression twice. I would go with "D". 'Passed' and 'Demonstrated' are both past tense words that express the same past tense grammatical idea.
If you have more questions, feel free to ask me.
Answer:
Am I dreaming?
It's quiet, though it crashes.
The silence of the tide.
They fly over it, but what do they see?
Do they feel calm? -- they see eternity.
The color of the tide.
Why must you feel afraid?
It's easy, see?
I can hear myself breathe,
I have no more responsibility.
The crashing of the tide.
I hope this helps! I just made it up myself.
