Which of these are incorrect and what is the correct answer?

Answer:
Which of the following is the Spanish verb estar used to describe?
Which of the following is the Spanish verb estar used to describe?
Which of the following is the Spanish verb estar used to describe?
Which of the following is the Spanish verb estar used to describe?
Explanation:
Which of the following is the Spanish verb estar used to describe?
Which of the following is the Spanish verb estar used to describe?
Which of the following is the Spanish verb estar used to describe?
Which of the following is the Spanish verb e