Which statement about antimatter is not true?
A) An antielectron (positron) is identical to an ordinary electron except it has a positive charge.
B) Every ordinary particle has a corresponding antiparticle.
C) When a particle and its antiparticle meet, the result is mutual annihilation that turns all of the mass into energy.
D) Antimatter has been hypothesized to exist but has never actually been detected.
D
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