a field trip to a museum of geology a field investigation of rock layers in a hillside a laboratory demonstration on the hardness of minerals a laboratory investigation of the identification of fossils
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: A hard hat would be used to protect a student during which type of investigation?
Possibilities:
- a field trip to a museum of geology
- a field investigation of rock layers in a hillside
- a laboratory demonstration on the hardness of minerals
- a laboratory investigation of the identification of fossils

a field investigation of rock layers in a hillside