Which important property of dna did friedrich miescher discover?

-it is made partly of sugar molecules.
-it has a double-helix structure.
-it is three-dimensional.
-it is found in the nucleus of a cell.

I think it was Rosalind Franklin who discovered what DNA was made up of. 
James Watson and Francis Crick discovered the double helix shape of DNA and also created a 3d model of it, so it's not B nor C.
To my understanding (you should double check) the answer is D

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