Which sentence demonstrates an error in parallel structure?
a.
for lunch, stacy brings a bologna sandwich on mondays, a ham sandwich on tuesdays, and a turkey sandwich on wednesdays.
b.
john needs to call a handyman to his house because his toilet runs, his icemaker is broken, and his faucet drips.
c.
to be a successful administrative assistant, you need to know how to use standard office equipment, how to answer calls with proper phone etiquette, and booking travel plans.
d.
the volunteers at the city's food bank separated donations into categories, stocked the shelves, and worked as cashiers.