A mile.
For reference, it's about 1,607 or so meters, and 1km is 1,000.
Explanation:
Sugar - Pure substance
Magnesium Ribbon - Pure Substance
Vegetable soup Heterogeneous mixture
Bath oil - Homogeneous mixture
Tin of assorted biscuits - Heterogeneous mixture
Peanuts and raisins - Heterogeneous mixture
Copper wire - Pure Substance
Bicarbonate of soda (Baking soda) - Pure Substance
The answer is A. Columb
Columb discovered a relationship between charge, their speration, and the force between the two charges in 1787
