Helping verbs are verbs that help the main verb in a sentence by extending its meaning. They can also add detail to how time is conveyed in a sentence. As a result, helping verbs are used to create the most complicated verb tenses in English: the progressive and the perfect aspects.
Its the past tense for tread. tread- to walk in a specific way
A. Melancholy and isolated because Rosaline has rejected him.
In such lines as " I have lost myself" and "What, shall I groan and tell thee?" Clearly express how Romeo is feeling dejected.
Benvolio will go on to encourage Romeo to look on other beauties, since he cannot have Rosaline.
I think the answer is OC because in variable line poetry, the intention is to produce this contrast consciously and to produce a rhythm of shorter and longer lines, like the rhythm of shorter and longer sentences.