Naphthalene balls used to repel moths and other insects are obtained from ___________.

Correct option is C

​​The correct answer is: (C). Coal tar

Explanation:

• ​Naphthalene balls are obtained from coal tar.
• Coal tar is a dark coloured thick substance obtained by heating coal.
• It is used in the manufacture of chemicals such as naphthalene, which is used to repel moths and other insects.
• Naphthalene balls are used to repel insects as they contain chemicals that are toxic to insects.