The postfix expression for the infix expression A + B × (C + D) / F + D × E is:

Use operator precedence and left-to-right associativity.

Infix expression:
A + B × (C + D) / F + D × E

Step 1: Convert the parenthesized part.
C + D → C D +

Step 2: Multiply by B.
B × (C + D) → B C D + *

Step 3: Divide by F.
B × (C + D) / F → B C D + * F /

Step 4: Add A to the result.
A + B × (C + D) / F → A B C D + * F / +

Step 5: Convert D × E and add it at the end.
D × E → D E *

Final postfix expression:
A B C D + * F / + D E * +

Hence, option B is correct.