According to Dr. Jeol Hiderbrand what accounts for his ageless energy

A．helped to overcome the physical discomforts the divers experienced when nitrogen was used.
B．was found by Dr. Jeol Hiderbrand.
C．is still universally acknowledged as standard practice up to now.
D．all that is included in A, B, and C.

A．His chemistry teacher was a great teacher.
B．His parents taught him chemistry when he was very young.
C．He was born in a time young people had greater freedom to decide what they wanted to do.
D．His talents were greater than his chemistry teacher.