Calculate the derivative of the function. Then find the value of the derivative as specified.
t = -1 if s = t2 - t
A. 
= 2t + 1; 
t = -1
= -1
B. 
= 2t - 1; 
t = -1
= -3
C. 
= t - 1; 
t = -1
= -2
D. 
= 2 - t; 
t = -1
= 3
Answer: B
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