Diamonds have sharp edges. Talc is softer than diamonds. Diamonds are very valuable. Talc and diamonds are both minerals.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Students observed that a diamond was able to scratch a piece of talc. What does this observation best support?
Possibilities:
- Diamonds have sharp edges.
- Talc is softer than diamonds.
- Diamonds are very valuable.
- Talc and diamonds are both minerals.

Talc is softer than diamonds.