Answer:
a. Syr Dar’ya
Explanation:
The Syr Dar'ya River is a long Central Asian river that flows in directions O and NO through Uzbekistan, Tajikistan and Kazakhstan until draining into the North Aral Sea. It is the Orexartes or Yaxartes of the classical Greco-Roman sources.
It is born in the extreme east of Uzbekistan, by the confluence of the Naryn and Kara Darya rivers. It has a length of 2212 km, but, with the Naryn River, it reaches 3078 km that places it among the 30 longest rivers on Earth. It drains a large basin of 782,669 km², although currently only 200,000 km² actually contributes its waters to the main stream.
