Answer: Si
Step-by-step explanation: The sentence is:
Un mercado municipal es de la ciudad.
And this means:
A municipal market belongs to the city.
And this is true, a municipal market is managed by the "municipalidad", and they are the ones that manage the city.
These markets are usually done to foment some type of market and help the smallest producers, that can go there and sell their products, so the right option is a; si