Explanation:

The meaning of the word 'discover' is to find something unexpectedly or during a search.

To know the correct synonym for the word we need to see the meaning of the given words

1. ignore - refuse to take notice of or acknowledge; disregard intentionally.

2. find - discover or perceive by chance or unexpectedly.

3. hide - put or keep out of sight.

4. neglect - fail to care for properly.

Hence the correct synonym for the word 'discover' is 'find'

So option 2 is the correct answer.