The correct option is A Halophiles
Methanogens :
Methanogens are bacteria that live in anaerobic swamps, marshes and gut of animals.
Halophiles :
Halophiles are organisms that can live in extreme saline environments such as salt lakes, salt marshes and salt solutions.
Heliophytes :
Plants which grow in full sunlight are called heliophytes.
Thermoacidophiles :
Organisms that live in hot and acidic conditions, like hot sulfur springs are called thermoacidophiles.
Conclusion :
Halophiles are organisms that live in salty areas.
Final answer:
Halophiles