Answer
Find out the what is the entrance fee for one student .
To prove
Let us assume that the entrance fee for the 25 student be x .
As given
Twenty-five members of the eighth grade class at Park Center Middle School are going to a museum and then to lunch.
Each student must pay an entrance fee to the museum and $7.25 for lunch.
The total cost for the trip is $443.75.
Than the equation
x + 25 × 7.25 = 443.75
x = 443.75 - 181.25
x = $262.5
Thus the entrance fee of the 25 students be $262.5

Entrance cost for one student = $10.5
Therefore the entrance fee for one student be $10.5
Option (A) is correct .
Hence proved