Answer:
all of the above
Explanation:
an expectation of a boom in housing prices
As people expect the price to increase they will try to close the deals before the prices raises to latter sale.
a news announcement of new health benefits discovered for a vegetable
the demand for this vegatable will be increased from the pharmaceutical industry to do new medicine. Also the people will see the utility from consuming this vegatable increase thus, demand will also shift to the right.
a rise in income due to a booming economy
If income increase, the overall consumption of the economy will increase across all market thus, demand curve will shift to the right.
