Which answer describes the calculations that could be used to solve this problem?

Thomas bought a case of 6 apple juice bottles and one 3-liter bottle of orange juice. Each apple juice bottle contains 2 liters of juice. How many liters of apple and orange juice did Thomas buy?

A.
Multiply 6 × 2. Then add 3 to the product.

B.
Multiply 6 × 3. Then add 2 to the product.

C.
Add 6 + 3. Then multiply the sum by 2.

D.
Add 6 + 2. Then multiply the sum by 3.