Answer:
Please see image attached.
Mustard's curve shifts Left as demand for this product constrains
Mustard's equilibrium price goes Down as demand for this product constrains
Mustard's equilibrium quantity goes Down as demand for this product constrains
Keep in mind that Mustard demand is affected negatively for the health study as it’s a complement of hot dogs then less quantity of hot dogs is expected to be consumed as well as less quantity of hot dogs.