According to this hypothesis, the viruses originate with a progressive process. The mobile of the moving parts of genetic material capable of moving within a genome, gained the ability to withdraw from one cell and enter into another. In other words, viruses have risen from genetic elements that have gained the ability to move between cells
.
The water is able to leave in and out of the cells because there is a cell membrane splits the bilayer of tissue and then the water start leaving and coming back in again from the stage of osmosis.
I believe that B and D are the only answers that I am sure of. C is incorrect and A seems incorrect as well. E may be a correct answer, but you will need to check the chemical equation. Hope this helps!