Answer:
1. An increase in the cost of some goods such as escalating gasoline prices.
Explanation:
The standard of living refer to a comfort level, the goods, and the material, necessities and wants that are available to a person
In case when there is a decline in standard of living so it is due to the increased in price as it reduced the purchasing power of the consumer
If the price of the goods increased, then the quantity demanded decreased as per the law of demand
Therefore in the given case, the option A is correct