Step 1: Understanding the Concept:
DNA is the hereditary material in humans and almost all other organisms. It is a polymer made of repeating units called nucleotides. Step 2: Detailed Explanation:
The name comes from the type of sugar molecule it contains (Deoxyribose) and its location and chemical nature (Nucleic Acid). It carries the genetic instructions used in the development and functioning of all known living organisms. Step 3: Final Answer:
The correct option is (a).