For two sectors in the same circle to be congruent they have to have the same arc measure.
We will check each of the statements:
A. the arcs must be supplementary. FALSE
B. The arcs must be complementary. FALSE
C. The central angles must be complementary. FALSE
D. The arcs must have the same measure. TRUE
E. the central angles must be supplementary. FALSE
F. the central angles must have the same measure. TRUE
G. the segments joining endpoints of each arc are congruent. TRUE
H. the segments joining the radius and arc must be identical. FALSE