Natural radioactivity is the random spontaneous disintegration of the nuclei of heavy isotopes of certain elements with the emission of

• A.\(\alpha\), X, and \( \beta\)
• B.\(\alpha\), \(\beta\) and \(\gamma\)-rays
• C.X, \(\alpha\), \(\gamma\)-ray
• D.\(\alpha\), \( \beta\) and X-rays
• E.