D I think tell me if I am wrong
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.
Answer:
D. source has more than three authors.
Explanation:
'et al.' is used in the in-text citations where three or than than three authors are to be mentioned for a particular work. The meaning of the Latin word 'et al.' is 'and others'. The last name of the first author is written and then 'et al.' is added to it. A comma (,) is then added along with the year of the publication of the work. In this way, the in-text citation is shortened by just adding the last name of the authors.