A suffix ment of nouns, often concrete, denoting an action or resulting state ( abridgment; refreshment), a product ( fragment), or means ( ornament)
Suffix -tion. (non-productive) Used to form nouns meaning "the action of (a verb)" or "the result of (a verb)". Words ending in this suffix are almost always derived from a similar Latin word; a few (eg gumption) are not derived from Latin and are unrelated to any verb.
D. pick one point of view and stay with it
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.
