The correct option is ILLUSTRATION / EXAMPLE. An exposition refers to an organized communication that gives a detailed explanation about a particular topic to a defined audience. The type of exposition in which the key words use are: 'for instance, for example and by way of illustration' is described as ILLUSTRATION / EXAMPLE exposition. Such communication strive to give explanations by using appropriate examples.
Alchemy is it is a blend of religion, mythology, astrology, philosophy, magic, spirituality, folklore and others whereas chemistry is used to describe the practical art of manipulating matter.
