From 12 o’clock midnight to 6 AM the temperature decreases by 12 see if the original temperature was 12 C which expression can be used to represent the situation

In the figure below, segment ac is congruent to segment ab: which statement is used to prove that angle abd is congruent to angle acd? a.)triangle acd is similar to triangle abd. b.)triangle acd is congruent to triangle abd. c.)segment a.d. is congruent to segment ac. d.)segment a.d. is congruent to segment dc.