Task: Class Definition Understanding (ontology: Earth_Environment/OBOE)

Which of the following definitions best describes 'Conductivity'?

A. measures how easily electricity flows along a certain path through an electrical element. The SI derived unit for electrical the concept is the siemens
B. the concept is a photometric measure of the luminous intensity per unit area of light travelling in a given direction. It describes the amount of light that passes through or is emitted from a particular area, and falls within a given solid angle. The SI unit for the concept is candela per square metre (cd/m2).
C. The developmental stage of life of a given organism.
D. is a measure of a material's ability to conduct an electric current. Units are siemens per meter

Answer: is a measure of a material's ability to conduct an electric current. Units are siemens per meter