The variable t represents the temperature at 3 p.m. Which equation would best model this word problem?  The temperature at the summit of Mt Mitchell dropped 23°F between 3 p.m. and 9 p.m. If the temperature at 9 p.m. was –10°F, what was the temperature at 3 p.m.?  
A.t – 23 = –10  
B.10 – 23 = t  
C.10 + 23 = t  
D.23 – t = –10
Please Explain the answer