What is the best evidence that solid materials condensed in our solar system wit

Question

What is the best evidence that solid materials condensed in our solar system within a few million years of the collapse of the solar nebula?

A. Evidence from the radiometric dating that some meteorites formed 4.55 billion years ago.

B. Chemical evidence that radioactive 26Al was present in the Earth and Moon when they formed.

C. Chemical evidence that radioactive 26Al was present in some meteorites when they formed.

D. Disks of gas and dust are observed around protostars that are only a few million years old.

Explanation / Answer

The answer is D. Because protostars are contracting mass of gas that represents an early stage in the formation of a star, before nucleosynthesis has begun.

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