Answer: Partnership
Explanation: In simple words, partnership refers to an agreement between two or more independent parties to join their forces for achieving a common business goal with the ultimate objective of earning profit.
In the given case, Dan and Emily were sole proprietors and now they are joining their forces also the case states their new entity will not be a separate entity and both of the owners will be having unlimited debt.
Hence from the above we can conclude that this is a partnership business.