设有如表4-47所示的关系R，R的候选码为(1)，R属于(2)范式。
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根据资料回答下列题目：
某国有企业在其所在城市有房屋三栋，其中两栋用于本企业经营，账面原值共600万元，另外一栋房屋租给某私营企业，年租金收入为30万元(当地房产原值减除比例为25%)。
该企业生产、经营自用房年应缴纳的房产税为()万元。
A. 4.8
B. 3.36
C. 5.4
D. 3.78
The central problem in economics is that of______.
A. comparing the success of command versus market economies
B. guaranteeing that production occurs in the most efficient manner
C. guaranteeing a minimum level of income for every citizen
D. allocating scarce resources in such a manner that society's unlimited needs or wants are satisfied as well as possible
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