For each question, choose from the options lettered A-E, the most appropriate one to complete the sentencels ont une voiture. c'est voiture.

To complete the French sentence "Ils ont une voiture. C'est ... voiture." we need to use a possessive adjective that correctly corresponds to the subject and the noun it qualifies.

1. **Subject and Noun Analysis:** - The subject of the first sentence is "Ils," which means "They" in English. - The noun in the second sentence is "voiture," meaning "car," and it is feminine singular.

2. **Possessive Adjective Matching:** - **"Ton"** (your) is used when referring to "tu" (you, singular) and is not a match for "ils." - **"Leur"** (their) is a possessive adjective for "ils" (they), and it fits because we are talking about something they possess. - **"Tes"** (your, plural) is related to "tu" (you) and is used when the noun is plural, which does not apply here since "voiture" is singular. - **"Nos"** (our) is used when referring to "nous" (we), which does not relate to "ils."

Therefore, the most appropriate word to complete the sentence is **"leur."** It correctly matches the subject "ils" and the context of possession. The completed sentence is: "Ils ont une voiture. C'est **leur** voiture."