What additional information did she provide about the payment?

The choice indicating that there would be a 2% surcharge is correct as it specifies a particular detail regarding the payment that wasn't initially known or mentioned. This indicates that an additional charge will apply, which is a key piece of information that informs the recipient about the total cost they need to consider when making their payment. It clarifies the original context of the payment by adding a specific financial implication and alters the expectation by including this new information.

In many contexts related to payments, knowing whether there is an extra charge is crucial for budgeting and planning, which is why specifying the surcharge is significant. Other options either suggest no additional cost, which doesn't expand on the payment information, declare payment as unnecessary, which is irrelevant, or state that the cost has increased without specifying how, making them less precise or informative in the context of the question.