Which statement correctly describes the song dynasty?

the dynasty established civil service exams to identify the best workers for government positions.
the dynasty encouraged artists in different fields to produce jade carvings and porcelain sculpture.
the dynasty created a vast empire that stretched from the east china sea far into western china.
the dynasty promoted virtuous leaders and scholars who studied the teachings of confucius.

The Constitution nowhere contains an express injunction to preserve the boundaries of the three broad powers it grants, nor does it expressly enjoin maintenance of a system of checks and balances. Yet, it does grant to three separate branches the powers to legislate, to execute, and to adjudicate, and it provides throughout the document the means by which each of the branches could resist the blandishments and incursions of the others. The Framers drew up our basic charter against a background rich in the theorizing of scholars and statesmen regarding the proper ordering in a system of government of conferring sufficient power to govern while withholding the ability to abridge the liberties of the governed.

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