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D. All humans are part of the same world and should be treated as equals.
A. single quotation mark -- hence the saying quote-on-quote :)
Actually, the correct sentence is the following one "You are much more logical than I".
Think about it as if it was a short version of the sentence
"You are much more logical than I am".: here you couldn't say
"You are much more logical than me am". that's why you also should not say it in the shorter version.
I would say ethier A or C are ur best guess