Which sentence demonstrates an error in parallel structure? A. Neither studying for a test nor doing your household chores sounds like a fun way to spend your weekend. B. Stephen Hawking is known not only for his achievements as a physicist but also because he bravely lives with ALS. C. Astronauts must be able to both perform complex calculations and maintain top physical condition. D. Applicants for the job at the municipal court must have earned either a high school diploma or a GED equivalency.