Answer:
The correct option for the given question is option(b) i.e 72 = amount;
Explanation:
In the option(a) the total variable store the value 9 which is a valid assignment
In the option(b) 72 is not a variable because the variable will never start with a numeric number. Therefore it is not a valid assignment statement.
In the option(c) the yourAge variable store the value of myAge variable which is a valid assignment.
So correct answer is an option(b).