Final answer:
Open accounts leave sellers in a position where most of the problems of international commercial finance work to their disadvantage.
Step-by-step explanation:
The option that leaves sellers in a position where most of the problems of international commercial finance work to their disadvantage is Open accounts.
Open accounts involve sellers extending credit to buyers by allowing them to pay for goods and services at a later date. This exposes sellers to the risk of non-payment or delayed payment, which can affect their cash flow and profitability.
Unlike other options like letters of credit, dollar drafts, forfaiting, and cash in advance, open accounts do not provide sellers with the same level of financial security and protection.