Find out the correct use of action words based on the picture.

The correct answer is: The boy is reading.

Let's look at the usage of action words in the options. 'The boy is reading' tells us that the boy is probably reading a book like it is shown in the picture. 'The boy is walking' tells us that the boy is taking a walk, but clearly, that is not what is shown in the picture. Therefore, the answer is 'THE BOY IS READING'.