**Core Concept**
The primary indication for precision attachment of Removable Partial Dentures (RPDs) is to achieve optimal retention, support, and stability in patients with well-supported abutment teeth, particularly when the denture-bearing area is small or the residual ridge is steep or undercut.

**Why the Correct Answer is Right**
Precision attachments are used to provide a secure and stable connection between the RPD and the abutment teeth. This is particularly important in patients with well-supported abutment teeth, where the denture-bearing area is small, or the residual ridge is steep or undercut. The precision attachment helps to distribute the forces of mastication more evenly, reducing the risk of denture slippage and improving patient satisfaction. The attachment also facilitates easier denture insertion and removal, which can be beneficial for patients with limited dexterity.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because precision attachments are not primarily used for patients with poorly supported abutment teeth, where a more conventional denture design may be more suitable.
**Option B:** This option is incorrect because while precision attachments can be used in patients with limited dexterity, it is not the primary indication for their use.
**Option C:** This option is incorrect because precision attachments are not typically used for patients with large denture-bearing areas, where a conventional denture design may be more suitable.

**Clinical Pearl / High-Yield Fact**
When designing an RPD, the clinician should carefully evaluate the patient's oral anatomy, including the size and shape of the denture-bearing area, the presence of any undercuts or steep residual ridges, and the patient's dexterity and masticatory function.

**Correct Answer: D.**