Final answer:
If Sarah ships a dead rosebush on behalf of a florist without disclosing this, both Sarah and the airline carrier could be liable.
Step-by-step explanation:
In this scenario, if Sarah ships a dead rosebush using an airline on behalf of a florist without disclosing her role, both Sarah and the airline carrier could be liable for the dead rosebush. Sarah would be responsible because she is acting on behalf of the florist and is responsible for properly packaging and shipping the rosebush. The airline carrier would also be liable because they have a duty of care to ensure that the items they transport are handled properly, and they may be held responsible if they mishandle or damage the rosebush during transit.