Question

What else would need to be congruent to show that triangle ABC congruent to triangle XYZ by SAS?

Answer 1

For SAS we need two congruent sides and a congruent included angle.  Since we're given angle B congruent to angle Y and side AB congruent to side XY, the only thing left to show is the remaining side:

Side BC congruent to side YZ

Choice B