Bill is traveling to Russia from New Zealand for the World Cup to root for New Zealand in their match against Fiji. The currency of New Zealand is the dollar, and the currency of Russia is the ruble. If Bill hears that the New Zealand dollar has depreciated against the Russian ruble, which of the following best describes the impact the depreciation has on his trip? Question 10 options: a) The number of dollars it takes to buy a ruble is smaller than the number of rubles it takes to buy a dollar b) His purchasing power has decreased c) The number of dollars it takes to buy a ruble is higher than the number of rubles it takes to buy a dollar d) His purchasing power has increased