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 in filling balloons for meterological observations because it is lighter and non-inflammable.
(D) It is used as dilute for oxygen in modern diving apparatus because of its high solubility in blood.
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