It is known that the opposite number of a is itself, the opposite number of B is the largest negative number, C is the smallest positive integer, D is the number with the smallest absolute value, and the value of a + B + C + D A. 2 B.3 c.0 D.1 E. cannot be calculated

The opposite of a is itself
a=0
The opposite number of B is the largest negative number
b=1
C is the smallest positive integer
c=1
D is the number with the smallest absolute value
d=0
a+b+c+d=1+1=2

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