According to the third angle theorem,

a.
if a triangle has two acute angles, then the third angle must also be acute
b.
if one angle of a triangle is congruent to another angle of the same triangle, then the third angle must also be congruent
c.
if two angles of one triangle are congruent to two angles of another triangle, then the third pair of angles is also congruent
d.
if the third angle of one triangle is congruent to the third angle of another triangle, then the two triangles are congruent

The correct answer is C. If two angles of one triangle are congruent to two angles of another triangle, then the third pair of angles is also congruent

Explanation:

In mathematics, the third angle theorem state if two angles of one triangle are congruent or equivalent to two angles of another triangle the third angle of both of the triangles would be the same. This can be explained because in a triangle the sum of all the angles is always 180° and therefore if you know two of the angles the third angle can be determined and if in two triangles two angles are the same the third will also be same for both. Therefore, according to the third angle theorem "if two angles of one triangle are congruent to two angles of another triangle, then the third pair of angles is also congruent".