We should know that , 1 lb = 16 oz
The amount of purchased celery = 12 lb = 12 x 16 = 192 oz
Trim and cut it into pieces, ending up with 5.5 oz of trim.
The yield will be = 192 / 5.5 = 34.91
Taking the smallest integer number.
So, the yield = 34
which will be equal = 34*5.5 = 187 oz
So, the yield percentage = 187/192 x 100 = 97.4%
The Answer is: A. 97%