Universal Containers has configured an agent to handle customer return requests.

The correct answer is B because deterministic fee calculation and reuse require state management, not conversational memory. The fee should be calculated by a Flow action, then stored in a context variable so the same validated value can be referenced later in the conversation. This prevents the large language model from recalculating, rounding differently, or hallucinating a new value during the refund summary. Option A is incomplete because simply exposing a Flow output once does not guarantee stable reuse throughout the session. Option C is unsafe because system instructions do not enforce calculation accuracy or persistence. Salesforce guidance states that variables can be used in filters, instructions, and action inputs, and Agent Script supports deterministic logic, setting variables, and running actions.