This is an "object to category" relationship.
Dog belongs to the category "mammal," and snake belongs to the category "reptile."
Number 3 and 4 don't make sense.
Number 2 includes the word other, making it flow smoother than the rest when you say it aloud.
I believe the closest antonym would be worsen
hope this helps
Answer:
Explanation:
Car-noun, Drive-verb, his-adjective, carefully-adverb