In an unpressurized aircraft, _____________ percentage of the occupants, other than the pilot, must be supplied oxygen between ____________ and ____________ feet lasting longer than 30 minutes.
a) 10%, 10,000, 15,000
b) 10%, 12,000, 14,000
c) 12%, 10,000, 15,000
d) 15%, 12,000, 14,000