To find the cost per pound of the sweet potatoes, you need to divide the total cost by the total weight in pounds.
The total cost is $6.32 and the total weight is 4 pounds.
Cost per pound = Total cost / Total weight
Cost per pound = $6.32 / 4
Now, let's calculate:
Cost per pound = $6.32 / 4 = $1.58
Therefore, the cost per pound of the sweet potatoes is D. $1.58.