laws passed by the government Internet sites discussing star formation pictures of stars of different ages evaluation of data by many scientists
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which of these is required to support the theory of star formation?
Possibilities:
- laws passed by the government
- Internet sites discussing star formation
- pictures of stars of different ages
- evaluation of data by many scientists

evaluation of data by many scientists