**Core Concept**
Stainless steel crowns are a common restorative material used in pediatric dentistry, particularly for primary teeth. Modifying these crowns involves techniques to adapt them to the individual tooth shape, ensuring a proper fit and seal.

**Why the Correct Answer is Right**
The correct methods of modifying stainless steel crowns for primary teeth involve using various techniques to reshape the crown, making it easier to cement in place. These techniques include using a bur or a crown trimmer to remove excess metal, allowing for a better fit around the tooth structure. This process helps to prevent over-contouring, which can lead to pulp damage or discomfort for the patient.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not provide a recognized method for modifying stainless steel crowns.
**Option B:** This option might be a distractor, but it is not a recognized method for modifying stainless steel crowns.
**Option C:** This option is incorrect as it is not a recognized method for modifying stainless steel crowns.

**Clinical Pearl / High-Yield Fact**
When modifying stainless steel crowns, it's essential to carefully remove excess metal to prevent over-contouring, which can lead to pulp damage or discomfort for the patient. A good understanding of the individual tooth shape and the techniques used to modify the crown is crucial for a successful restoration.

**Correct Answer:** C.