Select the option that can be used as a one-word substitute for the underlined words in the given sentence.

Can you explain to the person hired to drive our car, my everyday schedule?

chauffeur

The one-word substitute for the underlined words in the given sentence is chauffeur.

• Cardiologist is a doctor who specializes in the heart.
• Conductor is a person who leads an orchestra or choir.
• Chauffeur is a person who drives a car for another person.
• Calligrapher is a person who writes in a beautiful or elegant way.

Chauffeur is the most appropriate word for the given sentence because it specifically refers to a person who is hired to drive a car for another person. It is derived from the French word chauffeur, meaning "stoker."