The correct answer is: a) Mesopotamia and Central Asia.
The Harappan civilization was an ancient civilization that flourished in the Indus Valley from 3300 to 1300 BCE. The Harappans were skilled traders and their trade networks extended to regions as far away as Mesopotamia and Central Asia.
Mesopotamia is a region in Western Asia that is now part of modern-day Iraq, Kuwait, Syria, and Turkey. It was home to several ancient civilizations, including the Sumerians, Akkadians, Babylonians, and Assyrians. The Harappans traded with the Mesopotamians for goods such as copper, tin, and precious stones.
Central Asia is a region in Asia that is located between the Caspian Sea and China. It is home to several countries, including Kazakhstan, Uzbekistan, Kyrgyzstan, Tajikistan, Turkmenistan, and Afghanistan. The Harappans traded with the people of Central Asia for goods such as horses, camels, and wool.
The other options are incorrect because they do not represent regions that the Harappans traded with. Egypt and Greece are located in North Africa and Southern Europe, respectively. East Africa and China are located in Eastern Africa and East Asia, respectively. Southeast Asia is located in Southeast Asia.