As Part of a Market Research Project, You Survey Six

As part of a market research project, you survey six random people to see how much gas per week they would buy at various prices. The data you collect is in the accompanying table. What is the change in the total demand for gasoline in your survey when the price changes from $3 per gallon to $2.50 per gallon?
?
Quantity of Gallons of Gas Demanded Per Week
$$\begin{array} { | l | l | l | l | l | l | l | } \hline \text { Price per gallon of gasoline } & \text { Marty } & \text { Zain } & \text { Doc } & \text { Mikael } & \text { Zoya } & \text { Amirah } \\\hline \$ 1.50 & 10 & 15 & 6 & 20 & 20 & 6 \\\hline \$ 2.00 & 8 & 12 & 3 & 18 & 19 & 5 \\\hline \$ 2.50 & 6 & 9 & 1 & 14 & 17 & 4 \\\hline \$ 3.00 & 4 & 6 & 0 & 10 & 15 & 3 \\\hline \$ 3.50 & 2 & 3 & 0 & 4 & 12 & 1 \\\hline\end{array}$$

A) The total quantity demanded in the market falls by 11 gallons.
B) The total quantity demanded in the market falls by 14 gallons.
C) The total quantity demanded in the market rises by 16 gallons.
D) The total quantity demanded in the market rises by 13 gallons.