Well A and d are obviously wrong and based on context clues I’d go with B
b brownie is corre /.....................................
I think its C, don't take my word for it though, I'm not 100% percent about this.
The correct answer is found by grouping 1/3 with parentheses and following the order of operations, with division taking precedence.
9 – 3 ÷ (1/3) + 1
= 9 – 9 + 1
= 0 + 1
= 1
hope this helps!