The vocabulary word that describes these antonyms understate/play down / ignore is this:
1. Emphasize
An antonym is a word that stresses the opposite of another. In this text, we can see that the words indicate a non-emphasis on important things. This means that a lot of required attention is not given to the relevant topics.
So, in the list of options provided, it can be seen that the word which is the direct contrast or opposite of a word is the first one. It shows that attention is being given to relevant matters. Therefore, the correct antonym is "emphasize."
Learn more about antonyms here:
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