<span>C. the bus broke down, so we had to walk.</span>
It's The lightning thief, The sea of monsters, The titan's curse, The battle of Labyrinth, and Percy Jackson's Greek Gods. (That is the sequence of the book series.)
An oxymoron is contradicting words (deafening silence, jumbo shrimp, etc), a paradox is contradicting ideas (I must be cruel to be kind)
I believe that these two are correct.
The speaker feels sad and nostalgic because Atthis has forgotten her.
The speaker still feels sad about Atthis’s unfaithfulness.