Lara and jerome are examining the triangles formed by a diagonal of a parallelogram.
lara believes a diagonal will always partition a parallelogram into two congruent triangles. she says that because the diagonal acts as a transversal between parallel lines, the asa congruence criteria is satisfied by the diagonal and two angles formed by the transversal. jerome believes a diagonal will always partition a parallelogram into two isosceles triangles. he says that because every parallelogram has two pairs of congruent opposite sides, each triangle formed will have a pair of congruent legs. whose reasoning is valid?

a. only lara's reasoning is valid.
b. neither lara's nor jerome's reasoning is valid.
c. only jerome's reasoning is valid.
d. both lara's and jerome's reasoning is valid