Eusun is conducting research and he is determining the source of the information. He is particularly concerned since the information consists mainly of projections, interpretations, and estimates. Which question regarding research material is Eusun most concerned with?

The question that Eusun is most concern about is: Can the material be verified independently?

Explanation:

Independent sources in research projects refer to the option of finding different sources working independently that assure the same kind of information. The idea of finding different sources is to corroborate that it does not matter the place, time, and some other factors to achieve at the end the same conclusion or answer to the question.