Answer: B. Aral Sea
Step-by-step explanation:
The Syr Darya River is located in Central Asia where its source is somewhere in the Tian Shan mountains in Kyrgyzstan.
It then flows for several thousand kilometres through Uzbekistan and Kazakhstan into what is left of the Aral sea which was once the fourth largest lake in the world but after the Soviet Union diverted the waters of the Syr Darya river for irrigation, has now almost dried up.