Your answer is B because he uses “my darling” as a term of endearment.
Here's a few sentences with 'a'.
Billy helped a girl find her lost cat.
Georgia found a stray cat in an alley.
Remi got a suitcase for her birthday.
When Juliet and Romeo first meet, they speak in a sonnet. Their lines trade off back and forth and follow the structure and rhyme scheme of a traditional sonnet. Their other interactions are also very poetic in nature, but the sonnet especially is what shows the reader that their love is deep and pure, because sonnets represented a deep, important love.
The third one should be right