Answer:
Option (C) is correct.
Step-by-step explanation:
If there is a huge increase in the number of Americans travelling to Europe then as a result the demand for the euros increases in the foreign exchange market.
Americans won't be able to spend dollar for doing any transaction in Europe, so there is a need to exchange dollar for euros. Hence, this will increase the demand for euros and there is a appreciation of Europe currency. Therefore, the value of euro also increases.