The correct answer is option A, that is, obligate aerobes require oxygen from the atmosphere for survival, while obligate anaerobes do not.
The obligate aerobes refer to the species that need oxygen in order to survive. These organisms only attain energy from aerobic respiration, with the application of oxygen as the final electron acceptor for the electron transport chain.
On the other hand, obligate anaerobes are the species that do not utilize oxygen, however, they are poisoned by the usual levels of atmospheric oxygen, and they get killed in the presence of oxygen.