A chef uses 4 cups of potatoes to make a batch of mashed potatoes. If p represents the number of cups of potatoes, which equation models this situation?

A-p = 4n, where n is the number of batches.
B-p = 4n, where n is 1 batch of mashed potatoes.
C-p = n4n4, where n is the number of cups of potatoes in a batch.
D-p = n4n4, where n is the number of batches.