Which observation proves that a cell is a eukaryote?
a. it contains dna
b. it has dna inside a nucleus.
c. it has a cell membrane.
d. it contains ribosomes.

I believe that the most accurate answer for this would be b. Although I was stuck between a and b, b seems more credible because the fact that the DNA is inside a nucleus is more exact that just a vague "it contains DNA"

Hope this helps :)

Yeah in also my opinion( b.it has DNA inside a nucleus) is the right answer.

Search on internet it may you