<u>Answer</u>:
A) It fuels the fire of hatred between the houses of Montague and Capulet.
C) Samson, a Capulet servant, bites his thumb at two Montague servants, starting what becomes a street brawl.
D) Samson and Gregory, servants of the Capulets, bite the thumbs of two Montague servants they see in the street.
In this way, the symbol of thumb biting exemplify and advance the conflict between the Capulets and the Montagues at the beginning of the play
<u>Explanation</u>:
Capulets and Montagues are two families who are already against each other. Samson and Gregory, servants of the Capulets, saw the servants of Montagues passing through the street of Verona. They did not have a proper reason to fight with the servants of Montagues. But only because their masters were already in fight with them, he did such a gesture of thumb biting. They passed bad remarks at each other. Their feud was very weird, and led to a street brawl.