The correct answer is A.
Dante feels grief for Francesca's tragic life. He even weeps with pity for her situation. Dante considers her sin different from the others, because she could not rationally control falling in love. Other sins, like murder, require the sinner to actively choose to sin. On the other hand, falling in love happens without our choosing. That's why Dante feels so bad.
Here is the list of pronouns in the order they appear in the text, assigned to their particular groups:
1. interrogative pronouns (the ones who ask a certain question): WHAT, WHAT
2. possessive pronouns (the ones which show a certain possession): YOURS, YOURS
3. personal pronouns (I, you, he, she...): IT, IT, YOU, YOU, YOU, IT, US
4. indefinite pronoun (you cannot exactly determine who it is about): EVERYONE, ANYONE, SOME, ALL, EACH
5. relative pronouns (connect a clause to a noun/pronoun): WHO, THAT, WHATEVER
6. demonstrative pronouns (point to a particular thing): THESE
