I feel like it’s A or B but I have a strong feeling for A

your answer is given below..
The environment is rich in infectious agents that transmit disease through pathogens.
Because the heart has a very important task for the body, it follows a cycle called the cardiac cycle. The intervening pauses allows the blood to be emptied out completely from the atria and transferred to the ventricles before the ventricles finally pumps out the blood.
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Cytoplasmic DNA (extranuclear) occurs in Prokaryotes (Archaie and Bacteriae) but not in Eukaryotes (Eukarya).