What additional information do you need to prove abc=def by the sas postulate?

The question is missing the diagram, therefore, I cannot provide an exact answer.
However, I will try to help you with the concept.

To prove that two triangles are congruent by SAS, two sides and the INCLUDED angle in the first triangle must be congruent to the corresponding two sides and INCLUDED angle in the second one.

If the angle is not INCLUDED between the two sides, this postulate cannot be used to prove congruency

For the given question, pick the option which makes the angles included between the two sides

Hope this helps :)