Why Is It Hard for Scientists to Study Hyperthermophile Behavior

Why is it hard for scientists to study hyperthermophile behavior in the laboratory?

A) Hyperthermophiles can survive only at very high temperatures that are difficult to replicate in a lab setting.
B) Hyperthermophiles are physically identical to bacteria,making it hard to identify in a lab setting.
C) Hyperthermophiles have a short life cycle,which makes it hard to study one particular organism.
D) Hyperthermophiles can survive only at very low temperatures,which are difficult to replicate in a lab setting.
E) none of these