When the US dollar depreciates against other currencies, a) foreign goods become less expensive to US buyers. This is because the value of the dollar falls relative to foreign currencies, which typically leads to a decrease in the cost of imported goods.
On the other hand, b) US goods become more expensive to foreign buyers. This increase in price can lead to a decline in exports, as foreign buyers may seek cheaper alternatives from other countries.
While c) foreign currencies depreciating against the US dollar can happen, it’s not a direct result of the US dollar’s depreciation; rather, it would be a separate scenario influenced by various economic factors.
Finally, d) the volume of US imports is likely to rise initially as foreign goods become cheaper. However, over time, this may lead to adjustments in the trade balance depending on various economic conditions.
In summary, while all options touch on important aspects of currency depreciation, option a) is the most direct effect of the US dollar losing value against other currencies.