The answer is B. Controlling Trade. I have taken the test. Tip: Try to talk more formally it is more beneficial, and if you could speak more formal, you would be able to be understood better.
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The definition of communal is "Shared by all members of a community; for common use."
I would say that their kitchen <em>is</em> communal because their "community" consists of all the roommates who use the kitchen and contribute to it. If only one person contributed to the kitchen stock, then it would not be communal.
