Answer:
The correct answer is option B.
Explanation:
The law of demand is based on the assumption of ceteris paribus or other things being constant. Other factors such as income are assumed to be constant and the relationship between quantity demanded and the price is studied.
If the income of commuter increase he/she will be able to afford more products. This will cause an increase in the demand for products. Consequently, the demand curve will move to the right.