Answer:
To determine which of the following is not an opportunity cost of attending college, it's important to understand what opportunity cost means. Opportunity cost is the value of the next best alternative that must be forgone when a decision is made to pursue one option over another.
Now, let's look at the options:
1. The income you could have earned if you worked instead of attending college.
2. The cost of tuition and textbooks.
3. The cost of living expenses while attending college.
4. The lifelong friendships you make in college.
Based on the definition of opportunity cost, option 4, "The lifelong friendships you make in college," is not an opportunity cost. Opportunity costs typically involve tangible benefits or expenses that are sacrificed when choosing one option over another. Making friendships, while valuable, is not a monetary or resource-based trade-off in the same way that options 1, 2, and 3 involve financial or resource sacrifices.
Hopes this helps