Which of the following best describes the location of the first river valley civilizations? A. Civilizations developed in locations ideal for trade with natural defenses to prevent attack.
B. Civilizations developed in remote areas so that they did not have to spend tax money on defense walls.
C. Civilizations developed in dry areas where crops were difficult to farm.
D. Civilizations developed in areas ideal for trade but low in natural resources and defenses.

For me is

Civilizations developed in areas well suited for agriculture but relied on trade for everything.  

Explenation :

Examples of early river valley civilizations include the Indus Valley Civilization, Ancient Egypt (on the Nile), Mesopotamia (along the Tigris and Euphrates Rivers), and Chinese civilization along the Yellow River. The Indus River's source is in the Himalayan mountain range on the Tibetan P.

Thats what I know.

A. Civilizations developed in locations ideal for trade with natural defenses to prevent attack.

Explanation:

d is the correct answer.

b is incorrect because it makes food by itself

c is incorrect because us humans don't know how to produce their own food using the sun like plants.

a is incorrect because consumers can depend on carnivores for eating food for consumers to eat the dead organism. same thing with omnivores.

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