Which of the following stops execution of a thread?

Answer: Option B

Understanding Thread Execution Control in Java
Let's break down why one of these options stops a thread's execution.

Option A: Calling SetPriority() method on a Thread object
setPriority() is used to influence the scheduler to give a thread more or less CPU time.
It doesn't stop the thread; it just suggests a priority.

Option B: Calling notify() method on an object
notify() is used for thread communication.
It wakes up a single thread that's waiting on the object's monitor.
It doesn't stop the currently running thread; it potentially allows another thread to run.

Option C: Calling wait() method on an object
wait() causes the current thread to pause its execution and enter a waiting state.
The thread releases the lock on the object and waits until another thread calls notify() or notifyAll() on the same object.
This is the correct answer.

Option D: Calling read() method on an InputStream object
read() is used to read data from an input stream.
If no data is available, the thread might block temporarily until data becomes available.
While it *can* appear to pause the thread, it's waiting for I/O, not explicitly stopping execution in the same way as wait().
The thread remains alive.

In Summary: The wait() method directly suspends a thread's execution and places it in a waiting state, making Option C the correct answer.