The statistical details on the U.S. balance of international payments

The statistical details on the U.S. balance of international payments between 1790 and 1860 help economic historians determine

(a) what the U.S. sold domestically.
(b) how other countries paid for their own domestic goods and services.
(c) how the U.S. paid other countries for their exports.
(d) changes in domestic trade patterns.

ANSWER

(c)