The following question, consist of two words each that have a certain relationship to each other, followed by four lettered pairs of words. Select the lettered pair that has the same relationship as the original pair of words: Energy : Joule :: Volume : ?

The answer is D. Litre.

Energy is a physical quantity that is often measured in Joules. Volume is a measure of the amount of space that a substance or object occupies, and it is often measured in litres.

The other options are not correct because they do not have the same relationship to each other as energy and Joules.

• Solid is a state of matter, not a measure of quantity.
• Capacity is the amount of something that a container can hold, but it is not a measure of space.
• Kilogram is a unit of mass, not a measure of space.