To update Product Option B's quantity in real time when Product Option A is selected, a Price Rule must trigger dynamically in the configurator. Option A sets the Evaluation Scope to "Configurator" (for real-time updates during configuration), the Configurator Evaluation Event to "Edit" (triggering when edits occur), and
"Apply Immediately" on Product Option B (ensuring its quantity updates instantly). Option B (Calculator scope) applies during price calculation, not real-time configuration. Option C targets Product Option A's immediacy, but the rule must affect B's quantity. Option D combines Calculator scope with A's immediacy, missing the real-time configurator need. Salesforce CPQ documentation supports Configurator scope for real- time updates.References: Salesforce CPQ Documentation - "Price Rules" and "Configurator Events".