Answer:
Households are spending more than their current income.
Explanation:
Saving means Income that is not consumed & kept for precautionary, contingency purposes . Savings = Income - Consumption.
Dissaving means opposite: Consumption > Income (fulfilled out of previous savings reduction). The concept is clear from above formula also when savings will me mathematically negative , when Consumption > Income.
Dissaving is represented by saving function intercept on negative Y axis (reflecting autonomous consumption i.e consumption at zero level of income).
Other options are incorrect as : Income can be least zero , but not negative (less than 0) . Savings = Investment is rather macroeconomic equilibrium case , completely unrelated with negative savings.