State what additional information is required in order to know what the triangles are congruent by SSS.

Answer:
see below
Step-by-step explanation:
In order to show congruence by SSS (Side-Side-Side), you need to have 3 pairs of sides congruent. The diagram shows two pairs congruent (those of choice B), so you need information that the third pair of sides is congruent, choice D.
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Any answer choices involving angles are irrelevant for SSS congruence.