Answer:
A. 24:56
Explanation:
Let's find the answer by considering that 'X' represents the employees that earn the bonus and 'Y' the employees that didn't.
Where:
X=24
Y=56
Now, ''Express the number of employees who received the bonus as an unsimplified ratio to the number of employees who didn't receive the bonus'' means:
employees that earn the bonus : employees that didn't receive the bonus
which is:
X:Y = 24:56
In summary, the answer is A. 24:56.