The correct option is B 0
The product of a number and its reciprocal is 1.
35 is an example of proper fraction and its reciprocal is 53.
235 is a mixed fraction and its fractional form is 135, so the reciprocal is 513.
The reciprocal of 1 is 1.
The number 0 does not have a reciprocal. Because, if any reciprocal number is multiplied by 0, it will not give the product as 1. It will result in zero.