If the investor purchases yen, then first he will have to sell dollars to purchase yen, and at the time of bringing back his investment in U.S, he will have to sell yen to receive dollars. If U.S dollar were to gain against yen, then fewer dollars will be received when yen is sold, hence, the answer is:
A. No, If the value of the dollar goes up, then the investor will receive fewer dollars for the yen received from the sale of the investment . Therefore the investor should purchase the dollar investment