A. Atoms with an ironic bonds
Splicing, adding of the cap and tail, and the exit of the mRNA from the nucleus.
The answer for your question is C
D. Lysogenic cycle. In this cycle, viral DNA is inserted into the host cell's DNA. It divides with mitosis, soon creating many infected host cells. Once the lytic cycle is triggered (usually from external factors), the viral DNA is transcribed/translated into viruses.