Count by 1s. Write the missing numbers.

The correct answer is: 16, 18, 19

In the question there is a table in which some numbers are missing.
We have to find the missing numbers in the given picture.
Firstly, on counting backward by 1s before 17 we get 16.
Similarly, on counting forward by 1s after 17 we get 18.
Again, on counting forward by 1s after 18 we get 19.
So, the missing numbers are 16, 18 and 19.
Therefore, the correct option is b, i.e., 16, 18 and 19.