Answer: Option (d) is the correct answer.
Step-by-step explanation:
When simple inorganic molecules are used to lead to the formation of complex organic molecules then it is known as chemical evolution.
Basically in a chemical evolution more stable molecules are formed from different small forms.
For example, formation of polymers take place when number of monomer units combine together.
Hence, we can conclude that chemical evolution explains how living systems were created from non-living molecules.