According to the PMBOK® Guide, specifically within the Perform Quantitative Risk Analysis process, Interviewing is a key tool and technique used to gather data for quantifying the probability and impact of risks.

Mechanism: Interviewing techniques are used to quantify the probability and impact of risks on project objectives. The project manager or risk analyst interviews project stakeholders and subject matter experts to gather optimistic (low), pessimistic (high), and most likely scenarios.

Data Modeling: The information gathered during these interviews is often used to develop probability distributions (such as triangular or beta distributions) which are then used in modeling techniques like Monte Carlo analysis.

Purpose: While qualitative analysis uses subjective scales (Low, Medium, High), quantitative analysis requires discrete data points. Interviewing is the primary method to extract these numerical values from experts who have experience with similar project elements.

Comparison with Other Options:

Expert Judgment (A): This is a general tool used across almost all processes to provide a high-level opinion, but Interviewing is the specific, structured technique listed in the PMBOK® Guide for the data-gathering step of quantification.

Risk Registry (B): This is a document (Output), not a tool or technique. It is the place where risk information is stored.

Risk Response Planning (C): This is a separate process (Plan Risk Responses) that occurs after risks have been quantified and prioritized.