Which of the Following Sentences Is an Example of a Mixed

Multiple Choice

Which of the following sentences is an example of a mixed construction?

A) Gary and Joan were both asked to attend "sensitivity" training.
B) Alex was down with fever, so he asked his manager if he could be excused from work.
C) Laura is busy preparing for tomorrow's big presentation.
D) The manager graded the employment test, and the candidates were given the test scores.
E) She was asked to reduce the planned operating expenses in order for her budget to be approved.