If a Dollar Invested in the United States Yields the Same

Multiple Choice

If a dollar invested in the United States yields the same return as a dollar's worth of yen invested in Japan,then it implies that:

A) purchasing power parity exists.
B) the exchange market is in equilibrium.
C) the dollar/yen exchange rate is fixed.
D) interest rate parity exists.
E) both the currencies are pegged to a fixed amount of gold.