I would say tipped his hat because without it you need a word phrase or else the sentance wouldn't make sense.
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Answer:
directly related to the topic
Explanation:
The statement that best describes the word 'relevant' is option C which is "directly related to the topic".
The word 'relevant' means being useful or being in direct relation to a topic being discussed.
All the other options are wrong because they are not related to the topic being discussed.
Animals seem to sense your mood.
animals can be bestfriend for human beings