The opportunity cost of choosing option C instead of option B is 4 scarves.
What is the opportunity cost?
Opportunity cost is an economic term to refer to the value of the best unrealized option.
According to the previous definition, the opportunity cost of choosing option C over option B is 4 scarves because we had the opportunity to obtain 8 scarves with option B, but we chose option C with 4 scarves because it offered us the best option balanced between scarves and blankets.
So, the correct answer is C because it mentions the correct information, choosing option C represents 4 scarves less than option B.
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