Which of the following statements regarding helium is incorrect
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Which one of the following statements regarding helium is incorrect ?
(a) It is used to produce and sustain powerful superconducting magnets.
(b) It is used as a cryogenic agent for carrying out experiments at low temperatures.
(c) It is used to fill gas balloons instead of hydrogen because it is lighter and non-inflammable.
(d) It is used in gas-cooled nuclear reactors.