Step 1: Understanding the Concept:
Agarose gel electrophoresis is a technique.
It is used to separate molecules based on size.
Step 2: Key Formula or Approach:
No specific formula.
Need to understand gel electrophoresis.
Step 3: Detailed Explanation:
In agarose gel electrophoresis, DNA molecules are separated.
They move through the gel based on size.
Smaller molecules move faster.
This technique is not used for RNA, proteins, or carbohydrates.
Thus, DNA molecules are separated.
Step 4: Final Answer:
DNA molecules are separated in agarose gel electrophoresis.
Hence, the correct option is (A).