I think it’s all of the above
If I'm correct in thinking the play is "Romeo and Juliet", then Mercutio is related by being a character in said play. Hope this helps.
I think the significance of their argument had brought them to marriage. Both Lomov and Natalya often argue about the land that is situated between their properties. At first Lomov, only wanted to propose to Natalya because of their circumstance. However, Lomov had slowly fallen for her.
Answer
- I am not sure but I think the answer is of second one.
2. The answer is of last one.