What Does It Mean If a Substance Is Described as Being

What does it mean if a substance is described as being radioactive?

A) The substance emits high energy particles or rays from its unstable nucleus.
B) The substance was exposed to radiation that was given off by a decaying nucleus.
C) The substance readily absorbs energy from the radiofrequency region of the electromagnetic spectrum.
D) The substance is extremely small and special radiomicroscopes are necessary to view it.

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