To prove that STUV is a parallelogram, you typically need to establish that either the opposite sides are congruent or that the diagonals bisect each other.
Given the choices, the response that suitably demonstrates that STUV is a parallelogram is:
ST̅̅̅̅̅ ≅ UV̅̅̅̅̅̅ and TU̅̅̅̅̅ ≅ SV̅̅̅̅̅.
This statement shows that both pairs of opposite sides are congruent, which is a criterion for parallelograms. Therefore, it must be true that STUV is a parallelogram if these conditions are satisfied.