Analyze the sentence: "The teacher asked the students to hand in their assignments on tomorrow.'' Step 1: Identify the error
- Parts (A) and (B) are correct.
- Part (C) has the phrase "on tomorrow,'' which is incorrect.
- We do not use the preposition "on'' before "tomorrow.'' The correct phrase is simply "their assignments tomorrow.'' Step 2: Correct sentence
"The teacher asked the students to hand in their assignments tomorrow.'' Conclusion
Error is in part (C).