**Core Concept**
Restriction fragment length polymorphism (RFLP) is a technique used in molecular biology to detect genetic variations or polymorphisms between individuals. This is achieved by analyzing the fragments of DNA produced after cutting the DNA with specific restriction enzymes. The resulting fragments vary in size due to differences in the DNA sequence.

**Why the Correct Answer is Right**
RFLP is used to identify genetic variations, which can be associated with diseases or traits. The technique involves cutting the DNA with restriction enzymes, which recognize specific nucleotide sequences and cleave the DNA, resulting in fragments of varying sizes. These fragments are then separated by gel electrophoresis, and their sizes are compared to determine if there are any differences between the DNA samples. This technique is commonly used in forensic science, genetic testing, and disease diagnosis.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because RFLP is not primarily used for sequencing DNA. While it can provide information about the sequence of DNA, its primary use is to detect genetic variations.

**Option B:** This option is incorrect because PCR (polymerase chain reaction) is a technique used to amplify DNA, not to detect genetic variations. PCR can be used in conjunction with RFLP, but they are distinct techniques.

**Option C:** This option is incorrect because DNA fingerprinting is a technique used to identify individuals based on their unique DNA profiles. While RFLP can be used in DNA fingerprinting, it is not the only technique used and is not the primary application of RFLP.

**Clinical Pearl / High-Yield Fact**
RFLP is a powerful tool for detecting genetic variations, but it has limitations. The technique is sensitive to the quality of the DNA sample and can be affected by contamination or degradation of the DNA.

**Correct Answer: D. Identifying genetic variations.**