A Meteorite That Recently Fell to Earth Was Found to Contain

A meteorite that recently fell to Earth was found to contain evidence of the existence earlier in its history of a short-lived radioactive isotope of aluminum, ²⁶Al, which can be produced only under extremely energetic conditions and in nuclear reactions. What conclusion can be drawn from this observation?

A) An energetic nuclear event, a supernova, occurred near the formation site of the Sun, and it produced the ²⁶Al at about the time the meteorite was formed.
B) The meteorite became so hot on its descent through Earth's atmosphere that it became radioactive, and the ²⁶Al was formed at that time.
C) The meteorite had probably passed through radioactive clouds in space and collected the ²⁶Al before hitting Earth.
D) Radioactivity occurs spontaneously in normal matter, so this finding is not surprising.