Answer:
The correct answer is Nosotros se lo vendemos.
Explanation:
This is the case of the unstressed personal pronoun SE.
We use this to replace LE or LES, which are indirect complements, and when they follow with a pronoun LO, LA, LOS, and LAS.
As we can see in the example:
Nosotros vendemos el pan a las personas---- Nosotros se lo vendemos.
What are we selling? : "el pan"
