The assyrian empire was ruled by
a. a powerful monarch.
b. the governors of city-states.
c. medes and chaldeans.
d. government bureaucrats.

The Assyrians were one of the main peoples of the ancient Mesopotamia, mostly living in the northern Mesopotamia, and their empire grew and fell several times throughout history, mainly fighting the Babylonians for dominance. They first came to power after the fall of the Akkadian Empire, one of the strongest rulers of that period being Shamshi-Adad. After the death of this ruler the Assyrians have weakened and fall under the power of the Babylonians.

The strongest Assyrian empires ruled from 744 to 612 BC, when they had a number of mighty rulers, Tiglath-Pileser III, Sargon II, Sennacherib, and Ashurbanipal. One of the last Assyrian kings, Ashurbanipal, known for building a large library in the city of Nineveh, which has inherited ancient clay inscriptions from Mesopotamia, tells of Gilgamesh, the Hammurabi Code, etc.

The answer is: a.

he sent troops to protect the students as they entered the school.

the fact that could also be added to column b is that during world war ii, specifically between the years 1941 and 1945, japan expanded its territory towards the indonesian territory in what was known later as part of the "pacific war". in that time, japan could conquer the philipines, singapore,   borneo, central java, malang, cebu, sumatra and various other islands of the area, therefore expanding its territory for a brief period of time.