For a normal good, a decrease in demand is represented as a
a. rightward shift of the demand curve.
b. movement up and to the left along the demand curve.
c. leftward shift of the demand curve.
d. movement down and to the right along the demand curve.

C. leftward shift of the demand curve. 

Explanation:

A normal good is a good whose demand increases when income increases and falls when income falls.

The demand curve is represented as downward sloping curve. It slopes downward because the higher the price, the lower the quantity demanded and the lower the price, the higher the quanirty demanded.

A fall in demand is represented by a leftward shift of the demand curve. A rise in demand is represented by a rightward shift of the demand curve.

Factors that leads to a leftward shift of the demand curve:

1. Decrease in income

2. Change in taste - if consumers prefer other products

3. Season

4. Fall in price of substitutes

I hope my answer helps you

cognitive overload: having a lot on your mind impairs decision-making and tends to result in the simplest, but not necessarily best, option being selected.

empathy gaps: overlooking how you might feel in a different situation can result in unnecessary purchases, such as overbuying when shopping for food on an empty stomach.

optimism and overconfidence: wearing rose-tinted glasses and having unrealistic expectations about the future can affect money management and leave you unprepared for a change in circumstance.

instant gratification: seeking instant gratification drives impulsive spending and can undermine long-term planning and savings.

harmful habits: automatic or mindless behaviour can amplify a poor financial decision as it becomes a recurring event.

social norms: we are heavily influenced by the actions of others; while this can be in certain circumstances, it also contributes to the pressure to keep up with the joneses through conspicuous consumption.