Final answer:
A high interest rate is most likely to attract foreign investors and increase the value of a country's currency.
Step-by-step explanation:
The correct answer is A high interest rate. A high interest rate attracts foreign investors looking to earn a higher return on their investments. When foreign investors invest in a country, they need to exchange their currency for the local currency, which increases the demand for the local currency, therefore increasing its value.
Learn more about Factors attracting foreign investors and affecting currency value