Assertion. Non-default arguments cannot follow default arguments in a function call.

Reason. A function call can have different types of arguments.

(b)

Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

Explanation
In a function call, any parameter cannot have a default value unless all parameters appearing on its right have their default values. Hence, non-default arguments cannot follow default arguments in a function call. Python supports three types of formal arguments :

1. Positional arguments
2. Default arguments
3. keyword arguments