Find the error: Today educated nations are lead the developing nations of the world.

Of the world

Today

Are lead

None of these

"Are lead" is incorrect; it should be "are leading" for proper tense usage.

The correct sentence is: Today educated nations are leading the developing nations of the world.

آج تعلیم یافتہ قومیں دنیا کی ترقی پذیر اقوام کی قیادت کر رہی ہیں۔