In which of the exceptions does the external event causes the exception?

The correct answer is C. Asynchronous exception.

An asynchronous exception is an exception that is caused by an external event that occurs outside of the control of the program. For example, if a user closes the program unexpectedly, this would be an asynchronous exception.

A precise exception is an exception that is caused by a specific error in the program. For example, if a program tries to divide by zero, this would be a precise exception.

An imprecise exception is an exception that is caused by a general error in the program. For example, if a program crashes, this would be an imprecise exception.

A synchronous exception is an exception that is caused by an event that occurs within the control of the program. For example, if a program tries to access a memory location that is not allocated, this would be a synchronous exception.