Final answer:
Service quality is a core operational component of marketing channel performance, as it directly affects customer satisfaction and the channel's success. Option B.
Step-by-step explanation:
The operational components of marketing channel performance encompass a variety of factors that relate to the effectiveness and efficiency of the channel in delivering products from producer to consumer.
When evaluating marketing channel performance, we can consider options like product assortment, service quality, profitability, customer value, and sales revenue.
Among these, service quality stands out as a key operational component since it directly impacts the customer experience and satisfaction, which in turn affects the overall success of the channel. Option B.