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: cleaver knife
Explanation: because, well first of all using a fork would be very inconvenient for cutting and carving wood, a razor knife is used as cutlery for eating so it would render useless or it would take hours to carve out wood
A; because the narrator is usually a character in a story, who interacts with other characters.
Answer:
A complex sentence is made up of at least two independent clauses and 1 or more dependent clauses.
I can't really see number two...
