In simplifying expressions, the right order of operations must be followed. It is termed BODMAS
B represents bracket
O represents order
D represents division
M represents multiplication
A represents addition
S represents subtraction
We can see that division comes before multiplication
Looking at the given expression, the first step is to divide 48 by 4. it gives 12
The expression becomes
9 + 12 * 6
The next step is multiplication of 12 by 6.it gives 72
The final expression becomes
9 + 72
= 81
Therefore, the following statement is true about his answer
A. His answer is incorrect because he multiplied 4 by 6 before dividing.