If a, b are integers and |a-b|=4, which of the following is the smallest possible value of ab?  Choose the correct option.
A) -4  B) 0  C) 16  D) 7  E) 40
a=2, b=-2. Hence, the answer is -4.
<result>A</result>
If a, b are integers and |a-b|=4, which of the following is the smallest possible value of ab?