Zachary used the calculations shown to find how much he would spend on 16 ounces of pistachios. 6 ounces of pistachios cost $7.50 StartFraction 7 dollars and 50 cents Over 6 ounces EndFraction = StartFraction dollar-sign question mark Over 1-ounce EndFraction Unit price = $0.80 per ounce What was his first error? A. The price per ounce should have been $45.00 per ounce. B. The price per ounce should have been $1.25 per ounce. C. The final cost should have been $20.00. D. The final cost should have been $16.80.