Which list includes only physical properties
density, reactivity, and conductivity
boiling point, conductivity, and color
color, odor, and flammability
flammability, reactivity, and ductility

The list that include only the physical properties are: BOILING POINTS, CONDUCTIVITY AND COLOUR.

Physical properties are those properties of matter which can be observed and quantified without changing the composition of the material. Examples of physical properties are boiling point, melting points, electrical conductivity, colour, ductility, malleability, odour, density, solubility, polarity, texture, appearance, luster, hardness, etc.

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation: