The predicate is researches , because it is an subject
Answer:
Which has a fascinating history
Explanation:
The best adverb clause which would complete the sentence is given above. This is because, the sentence is talking about Mexico as a country in which Oscar was born in. The country has a fascinating history going by its rich culture and traditions of the people living in it.
It means that all the deaths of people get to him/her. Meaning that he/she hates all the deaths that's been happening. <span />