Answer: a. Love and Marriage.
Once Ruku and Nathan confess their secrets to each other, they are finally able to stop Kun thi's blackmail, and the emotional control she had over them. Instead of the secrets breaking them apart, as we could have expected, their honesty makes their relationship stronger. This shows that their marriage is based on true partnership, and that their love is strong and sincere. Therefore, it is a passage that expresses the theme of love and marriage.