I actually think B would fit here. If you need the object in a new data space, copying it with Data Copy and linking the DMO makes sense based on how segregation usually works. Could be the trap but that’s my take.
I don't think it's B. That option is for copying the underlying data, but the question just wants to make the object available in another data space, not duplicate records. D lets you configure which objects show up where. Sometimes people get tripped up by wording here-anyone run into an actual scenario where data copying was needed just for mapping?
This comes up if the object just isn't visible in the data space because it wasn't configured there yet, not because of missing data. D works since you can explicitly add the object via the Data Space tab and don't have to create/copy data or streams. If they'd asked about sharing or duplicating the underlying records themselves, B might fit, but here it's just access to the object that matters. Pretty sure that's right-anyone think of a scenario where C makes sense?