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

Because the earth is not round ,but it may seem round when viewed from ,our planet but true some points earth is not round was an oblate spheroid -a square that it squashed as globe however is not even a perfect oblate spheroid.in fact isaac newton's first proposed that earth was not perfectly round but it was an oblate spheroid instead.that mean a square that is squashed as its poles and swollen at the

Idont really understand