Edwin graphs the relationship of the gallons of milk he buys in terms of dollars. Sam buys milk from a different shop. He writes an equation for the amount he spends on milk, p = 3.4g, where p is the cost and g is the gallons of milk bought. Who buys milk at a lower rate, and what is the price?

A.
Sam buys milk at a lower rate, $3.50 per gallon.
B.
Edwin buys milk at a lower rate, $3.50 per gallon.
C.
Sam buys milk at a lower rate, $3.40 per gallon.
D.
Edwin buys milk at a lower rate, $3.40 per gallon.