You should put "they", "he", or "she", in front of the word stretching to make it third person.
1.) They were stretching.
2.) He was/ is stretching.
3.) She was/is stretching.
Hope that helps.
The correct answer is C: Nature morte
<span>ici sont 8. A: Andorre, Belgique, Allemagne, Italie, Luxembourg, Monaco, Espagne, Suisse</span>