I would say the answer is D, because when writing a summary you should probably include all of the things listed in the other options. Hope this helped!
-TTL
Santa Monica, California
Paris, France
Yulin City, Shaangxi Province, China
Sydney, Australia
The logical fallacy can be deepened depending on your morals, but the logical fallacy is the world "should". This implies that living together before marriage is the only way that a marriage should work out, or that it is the "right" way. Both of those assumptions are false, because traditionally (typically the "right" way), couples would not live together before marriage, and many couples had their marriage work out perfectly without this.