Lilly bought strawberries and blueberries for a picnic. Strawberries were on sale for $2.50 per pound, and blueberries were on sale for $4.00 per pound. She bought a total of 8 pounds of berries and spent $26.75 altogether. How many pounds of strawberries and blueberries did she purchase for the picnic?

A. 4.0 pounds of strawberries and 1.6 pounds of blueberries
B. 4.5 pounds of strawberries and 3.5 pounds of blueberries
C. 1.6 pounds of strawberries and 4.0 pounds of blueberries
D. 3.5 pounds of strawberries and 4.5 pounds of blueberries