Option B= flammability
Flammability is a chemical property because combustion is a chemical change. A chemical change is a process in which one or more substances are converted into one or more new substances with different properties.
Gasoline is highly flammable. When it burns, it is converted into carbon dioxide and water. These have different properties from gasoline, so combustion is a chemical process. Flammability is a measure of how easily something will burn.
Heat of combustion, reactivity with water, PH, and electromotive force.
While density color and melting point are examples of physical properties.
