Answer:
the sum of all prices that the individual buyers are willing and able to pay for each possible quantity of the good.
Step-by-step explanation:
Market demand refers to the sum of the individual demand for a commodity from all buyers in a given market.
A market demand curve is therefore a graph that shows the the sum of the individual demand for a commodity from all buyers in the market.
Therefore, the correction option is "the sum of all prices that the individual buyers are willing and able to pay for each possible quantity of the good".
Note that the market demand curve is a downward sloping curve due to the fact that there is a negative relationship between price and quantity demanded. That is, as price increases, the quantity demanded decreases. On the other hand, as price decreases, the quantity demanded increases.
Also note that an example of a market demand curve is given in the attached graph. From the graph, it can be seen that when price is
, quantity demanded is
. But when price falls to
, quantity demanded increased to
. This shows the negative relationship between price and quantity demanded as explained above.