What Is the Most Likely Reason That Milk Sold in Convenience

What is the most likely reason that milk sold in convenience stores is more expensive than milk sold in grocery stores?

A) Convenience stores sell milk in smaller packages, so the per-gallon packaging costs are higher.
B) Grocery stores buy in bulk, while convenience stores buy milk in smaller quantities.
C) People who buy milk at convenience stores tend to have a less elastic demand for milk.
D) Convenience store owners are greedier than grocery store owners.