For this case we can translate the sentence given as:
What___________ in the market yesterday?
The sentence must be completed with the proper conjugation of the verb "buy" ("comprar" is Spanish)
From the simple perfect preterite we have:
Yo compré
Tú compraste
él/ella/Ud. compró
nosotros compramos
vosotros compramos
ellos/ellas/Uds. compraron
The sentence is in the second person singular, so the correct option is "compraste"
Answer:
Qué compraste en el mercado ayer?
Answer:
join the ends of two pieces of metal or timber by notching them so they fit over or into eachother
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