Answer:
The correct answer is option b.
Step-by-step explanation:
Law of demand says that the there is an inverse relationship between quantity demanded of a commodity and its price, keeping other things constant.
The other factors here are price of substitutes, income level, tastes and preferences etc.
The individual demand curve shows the quantity demanded of a commodity at different price levels.
In this case, to derive individual's demand curve for salmon, we need to observe changes in the utility maximizing bundles when price of the product i.e salmon is changed, keeping other factors constant.