Inorder $:\{a\#[((b\$c)\$d)\#(e\#f)]\}$ (given in question)
If we observe, first evaluation is $ b\$c$
So, (\$) has higher priority.
Therefore, either option (A) or (C) is correct
$\underline{\text{Option A}}$
$\$$ has higher precedence and $\#$ is right associative.
From tree, it is clear that $(e\#f)$ is evaluating first which is to the right side of the root.
Therefore, $\#$ is Right Associative.
So, Option A is correct
$\underline{\text{Option C}}$
$\$$ has higher precedence and $\#$ is left associative.
This is wrong.
Correct Answer: A.