What was the major concern about the construction and operation of supersonic airliners in the 1970s and 1980s?
a) The sonic booms from the high-speed aircraft could cause hearing loss amongst the passengers
b) Exhaust from these high-flying jet aircraft could damage the protective ozone layer around the Earth
c) The airliners could be easily converted to weapons of war and be equipped with nuclear weapons
d) The amount of fuel required would produce global gasoline shortages during heavily traveled holidays