they are part of the instructions. they are used to test a hypothesis. they are required to make a hypothesis. they keep you safe during an investigation.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Observation and measurement are important to scientific investigations because
Possibilities:
- they are part of the instructions.
- they are used to test a hypothesis.
- they are required to make a hypothesis.
- they keep you safe during an investigation.

they are used to test a hypothesis.