What is volume?
OA) half of the density of a substance
OB) the amount of matter in a substance
OC) twice the amount of mass of a substance
OD) the amount of space a substance takes up

The answer would be d because a first grader would know that

The condition that potassium bromide can conduct electricity is  : a. only when melted or dissolved in water

Potassium bromide is an ionic compound. In order for it to conduct electricity, it must be in a liquid state or been dissolved in a liquid

hope this helps