Final answer:
Russia is approximately 1.7 times larger than Canada, the second-largest country, which makes the options provided inaccurately represent the size difference. None of the given multiples exactly matches the size difference between Russia and Canada.
Step-by-step explanation:
Russia is by far the largest country in the world, covering over 17 million square kilometers. The second-largest country is Canada, which covers nearly 10 million square kilometers. When comparing the size of Russia to Canada, Russia is not twice, three times, or five times as big. Instead, if we're comparing Russia's size to that of Canada, the correct answer is that Russia is around 1.7 times larger than Canada. However, none of the given options (a, b, c, d) are exactly correct, since the difference does not precisely match any of these multiples. For mathematical clarity, if we use simple division, we find that 17 million divided by 10 million is 1.7, which is closest to twice as large but not exactly any of the given options.