<span>One day it was a hare and a tortoise who argued who was the fastest so they decided to make a race to see who was the fastest one, so when that day came the hare run the fastest as he could so when he was looking back he noticed that the tortoise was super behind him like 100 miles away so he decided that he was going to take a soak , so he was confidence that he was going to win and because of his carelessness the tortoise won the race.</span>
As usual in life, motives can be complicated. The theme of Ivan Illych marrying this woman because of her money and her social position is one possibility that he discusses (she comes from a "good" family and has some property). The other theme is that she is pretty and he fell in love with her and to some extent she complements his views on life. In choosing from the options, re the themes, I would say that a) conforming to social conventions and b) the necessity of companionshp should be the two main themes in this excerpt.
Incredibly is very or in abundance
The answer to this question is b.