score: $\frac{18\mathrm{.}67}{50}$ pts $(37\mathrm{.}33\%)$

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We do not see complete specialization in the real world because

A$.$ all goods and services are traded internationally, production of most goods involves increasing opportunity costs, and tastes for products are remarkably uniform.

B$.$ not all goods and services are traded internationally, production of most goods involves increasing opportunity costs, and tastes for products differ.

C$.$ not all goods and services are traded internationally, production of most goods involves decreasing opportunity costs, and tastes for products differ.

D$.$ not all goods and services are traded internationally, production of most goods involves constant opportunity costs, and tastes for products are remarkably uniform.