Step 1: Understanding the problem.
The images contain random dots and distortions caused by low lighting conditions, which are referred to as noise.
Step 2: Identifying the technique.
• (A) Cropping: Removes parts of an image.
• (B) Noise Reduction: Correct. Removes unwanted distortions and improves image clarity.
• (C) Resizing: Changes image dimensions.
• (D) Normalization: Adjusts pixel intensity values.
Step 3: Conclusion.
Thus, the technique used to remove distortions is Noise Reduction.
Final Answer: Noise Reduction.