Answer:
d. Fall to $1.47
Explanation:
currently you will need $1,500 to purchase £1,000 and invest in British bonds. After 65 months you will have £1,040, which you should be able to convert into $1,544.40. If you invested in US bonds, you would have $1,530, so this arbitrage will yield $14.40.
But if instead the British pound fell to $1.47, then your profit would only be $28.80, less than if you invested in US bonds. You again would have £1,040 in 6 months, but that would only be equal to $1,528.80.