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When a problem is researched, authoritative sources should be used because they

include thoughtful opinions.
are up to date.
are easy to find.
contain relevant information.

Respuesta :

mellief50

Answer:

A or B i believe. You should define the word authoritative before picking a choice to determine which one it is. I would lean more to D

Answer:

its B or Are up to date

Explanation:

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