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Let's go through each option to see if it makes sense as the strongest criticism of Norway's economic system. a) it provides too many benefits: Norway is well known for its extensive welfare system, which could be seen as a criticism. However, we must compare it to the other options to see if it is the strongest criticism. b) its taxes are too high: Norway indeed has high taxes, which fund the welfare system and other benefits. This might be a stronger criticism compared to option (a), as high taxes can be a concern for both individuals and businesses. c) its taxes are too low: This option contradicts option (b) and is not commonly considered a problem for Norway, so we can rule this option out. d) it doesn't provide enough benefits: This option contradicts option (a) and given that Norway is known for its comprehensive welfare system, this option is unlikely to be the strongest criticism.

Comparing the options, we can conclude that option (b) presents the strongest criticism of Norway's economic system, as high taxes may negatively impact individuals and businesses. So, the correct answer is: b) its taxes are too high