Academic Writing Directions: Use Your Knowledge of Writing, Editing, and the Conventions of the Conventions

Academic Writing Directions:
Use your knowledge of writing, editing, and the conventions of grammar to answer the following questions.
Which of the following simple sentences is incorrect? ​

A) ​Neither his mother nor his father is prepared for him to enter the army.
B) ​Her sister and her brother are visiting and are taking her out for her birthday.
C) ​Tyson's motorcycle, car, and truck is going to need repairs.
D) ​Tania's roommate studied for an hour, worked out at the gym, and then took a nap.