Before you o somewhere try and learn as much as you can about their culture. Don't want to go somewhere and the people kill you because you did something they think is terrible. Oh and learn the basics of their language
Estan Caminando isn't the answer as because "estan" implies to be another person, but this isn't the case as it's only the man, the man isn't walking (caminando either)
He isn't shopping (comprando) and he isn't painting (pintando)
The only logical answer is he's cooking (cocinando) which is also heavily implied as him having the bowl and whisk
B.) Esta Cocinando is your answer
There are plenty of ways but I would go with this:
¿Cuál es su número telefónico de la oficina ?
Answer:
B- Vamos a poner la silla en el comedor.
Explanation:
The student is explain where to put the chair.