The right answer is C.
Uranium (U) is an element of atomic number 92,
It is a heavy radioactive metal. Its radioactivity, added to that of its descendants in its disintegration chain, develops a huge power used for generating electricity.
Uranium is also reprotoxic via a deleterious effect on the reproductive organs; either because of its radioactivity, or because of its chemotoxicity, or both.
B
Publish his findings in a research journal because he is experimenting what medicinal properties can be tested or are associated with the plant. He should have kept the notes in a research journal for making observations so B.
I think tissue or a nucleus
Since water is polar, and these molecules are nonpolar, they don't exactly interact in anyway.
Since they can't interact, when you pour any of those elements in a recipient with water, you can clearly see both liquids and they don't mix.
Hope it helped, BioTeacher101