What is the loess of the Yellow River?
the source of the river on the high Tibetan Plateau
the twists and turns that cause the river to flood
fertile, yellow-brown silt
a term referring to the flooding of the river

in 342 bc j._c. egypt fell into the hands of the persians, under the reign of nectanebo ii

greek city-states unite in a revolt against the persian empire at the beginning of the fifth century bc. j.-c  

from the year 660 or 659 bc ad, cyrus preached the revolt against the medes to deliver the persians.

it would be d). more resources must be obtained to attain that combination of goods and services