heating the sample on a hot plate scratching the sample with a nail hitting the sample with a hammer shining a bright light on the sample
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which of the following actions is most likely part of a test to find the hardness of a mineral sample?
Possibilities:
- heating the sample on a hot plate
- scratching the sample with a nail
- hitting the sample with a hammer
- shining a bright light on the sample

scratching the sample with a nail