What do scientists need to look at before developing an argument?
The validity of data, claims, hypotheses, and observations.
Their opinion and personal views.
The arguments of famous people on the topic.
The arguments that make the most sense for society.

The validity of data, claims, hypotheses, and observations.

Explanation:

Scientists use scientific methods and observations to develop arguments and it's basis must be on facts and not opinions or preferences. The experiments carried out should also be reproducible with no discrepancy.