After a seller’s presentation, the customer mentioned that another supplier offered the same service at a lower price. In response, the seller pointed out the supplier’s poor quality levels and lack of customer attention after the sale.

Following up refers to the actions taken after an initial sales conversation to maintain contact with the customer. While it is an important sales strategy for nurturing relationships, it does not specifically address the situation where a customer raises concerns about a competitor's pricing. Thus, this choice does not align with the seller's immediate response to the objection.

Closing the sale involves finalizing the transaction and securing the customer's commitment to purchase. Although this step is crucial in the sales process, it typically occurs after addressing any objections. In this case, the seller’s focus was on resolving the customer's concerns rather than concluding the sale, making this choice incorrect.

Presenting the product involves showcasing the features and benefits of a service or product to attract the customer's interest. In this scenario, the seller was not simply presenting the product but rather responding to an objection, which requires a different approach. Therefore, this choice does not accurately describe the seller's action in this context.