Exact Extracts from Salesforce Billing Implementation Guide:

“When generating invoices, Salesforce Billing uses the billing account attached to the order as the billing entity.”

“If a billing account is specified on the order, its details (including Billing Address) take precedence over the order or account-level billing information.”

“If no billing account is provided, the system falls back to the order’s billing fields, and then to the account’s default billing profile.”

Step-by-Step Reasoning:

Hierarchy for billing address resolution:Billing Account (highest) → Order Billing Address → Account Billing Profile (lowest).

In this case:

Billing Account (Chicago) exists and overrides all others.

Why B is Correct:The billing process will use Chicago, because the billing account attached to the order dictates the billing details.

References :

Salesforce Billing Implementation Guide — Billing Account Hierarchy and Invoice Address Resolution

Salesforce Subscription Management Implementation Guide — Order Billing Account Logic