Answer:
Options (1), (2) and (4)
Step-by-step explanation:
The shift of the demand curve to the right should an increase in demand caused by the change of other factors apart from the price of wheat bread.
Option 1 - The population of Arizona grows by 20%
This will likely result in a shift in the demand curve of wheat bread to the right (an increase in demand) as more people buy wheat bread due to the population growth.
Option 2 - A drought in Kansas makes people believe that the price of wheat bread will increase in a couple of months
An expectation of a future increase in the price of bread will likely drive up the demand for the commodity as people buy in a bid to store up at cheap prices before the increase in price sets in.
Option 3 - People learn that certain bread additives may be bad for their health
Demand for an item considered hazardous will most likely decline significantly as people shift to consuming more healthy products.
Option 4 - As people become more health conscious, they discover the benefits of whole wheat as a part of their diet
Demand for wheat bread in this case in likely to increase due to the same reason adduced for option 3, as the benefits make people consume more of the commodity.