Acritical thinker would most likely say, "what i need to know most is

A critical thinker would most likely say, "what i need to know most is how they got this information. "

Explanation:

People who are often critical thinkers tend to be open-minded to different news and ideas, and are rational, reasonable, and collaborative. However, in order for new ideas and information to be accepted, critical thinkers need to know the origin of this idea and this information so that they can rationally assess whether the information is true and the idea is really good. For this reason, a common phrase to be spoken by critical thinkers is "what I need to know most is how they got this information."

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