Sara and Zoe are the only people in an economy. The following data tells you about their purchases of soda.
Sara bought 3 bottles when the price is $3 a bottle, 4 bottles when the price is $2 a bottle, and 5 bottles when the price was $1 a bottle.
Zoe bought no soda when the price was $3 a bottle, 2 bottles when the price is $2 a bottle, and 3 bottles when the price was $1 a bottle.
In the market for soda, the quantity demanded is ______.

A. 4 bottles at $2
B. 5 bottles at $1
C. 5 bottles at $3
D. 6 bottles at $2