Choose the incorrect sentence in connection to the use of "the". The sugar causes diabetes., The Nile is the longest river in the world., He is learning to play the piano., She walked into the room quietly.

Choose the incorrect sentence in connection to the use of "the". The sugar causes diabetes., The Nile is the longest river in the world., He is learning to play the piano., She walked into the room quietly.

Explanation

"Sugar" as a general, uncountable noun doesn't need "the" when talking in general.

Correct form: "Sugar causes diabetes." — remove "the" for general statements.