The product of two consecutive odd no is -1, then what is the value of the sum of them. Choose the correct choice:
A) -2  B) -1  C) 0  D) 1  E) 2
Two odd numbers are -1 and +1.   -1+1= 
<gadget id="calculator">-1+1</gadget>
<output>0</output>
0   ANSWER:0
<result>C</result>
The product of two consecutive odd no is -1, then what is the value of the sum of them.