Answer: a. benefit from; be adversely affected by
Step-by-step explanation:
Because foreign transactions have to be executed in foreign currency, having a stronger dollar would benefit a US based company such as Springfield Co. as they will be able to get MORE foreign currency per dollar to be able to engage in transactions.
Conversely, having a weaker dollar could affect a US based company adversely as they will only get LESS of the currency in question and thus have to pay more per dollar in the transaction.