What else would need to be congruent to show that ABC PQR by SSS?
I think its C?

Answer:
Find out the what else would need to be congruent to show that ΔABC ≅ ΔPQR by SSS .
To prove
SSS congurence property
Triangles are congruent if all three sides in one triangle are congruent to the corresponding sides in the other triangle.
As given
[tex]\bar{AC}\cong \bar{PR}[/tex]
[tex]\bar{AB}\cong \bar{PQ}[/tex]
Thus to prove ΔABC ≅ ΔPQR are congurent by SSS congurence property.
Thirds sides of both the triangles must be congurents.
i.e
[tex]\bar{BC}\cong \bar{QR}[/tex]
Therefore Option (C) is correct .