In C, the order of evaluation of printf arguments is unspecified. However, the values are computed right-to-left before printing. Starting from i=5: i++ makes 6, i-- makes 4, ++i makes 5, --i makes 4, and i is 4. But compilers may vary. On systems producing 4 5 5 4 5, this matches option D. This tests understanding of increment/decrement operators and evaluation order.