Which one among the following rivers is the longest? 1) Amazon 2) Amur 3) Congo 4) Lena [2007]

Which one among the following rivers is the longest?

Among the rivers listed, the Amazon River is the longest. Recent estimates place its length at around 6,400 km, which is greater than that of the Amur River, Congo River, and Lena River. The Amazon River drains into the Atlantic Ocean. The Amur River, which stretches an impressive 4,444 kilometres, is the tenth-longest globally. It serves as a natural boundary between the Russian Far East and northeastern China before emptying into the Sea of Okhotsk, the Pacific Ocean, and the Strait of Tartary.
The Congo River, the ninth-longest river, is Africa’s second-longest and second-largest in terms of discharge volume. It flows for 4,700 kilometres through multiple countries, including the Democratic Republic of the Congo, the Central African Republic, and Angola, crossing the equator twice before emptying into the Atlantic Ocean.
The Lena River is the 11th longest river in the world, stretching 4,400 km across Siberia. Flowing entirely within Russia, it originates in the Baikal Mountains and empties into the Arctic’s Laptev Sea.