Question: Which of the following sentences is incorrectly structured in passive voice?

Options:

1. The song was sung by the choir.
2. The homework was completed by the students.
3. The cake was baked by her mother.
4. The teacher was given the assignment.

Correct Answer: The teacher was given the assignment.

Solution:

This sentence is in active voice. The subject \'the teacher\' is performing the action of receiving the assignment.