Some Organisms Are Not Able to Live in an Environment

Some organisms are not able to live in an environment where there is oxygen; these types of organisms are called obligate anaerobes. Which explanation is most plausible for how they survive without oxygen? ​

A) They are able to survive using less energy than aerobes.
B) All of their ATP is imported into the cell from an external source.
C) Sulfur is used instead of oxygen because it is chemically similar.
D) These organisms use photosynthesis to produce energy.
E) Their mitochondria are damaged, and consequently they are short-lived.